How Much Air Should Be In My Trailer Tires? [Load Ratings]




Key Takeaways :-

  • The ideal air pressure for your single axle trailer generally falls between 50 and 65 pounds per square inch (psi), but it can vary based on your specific trailer and tire type. Always refer to manufacturer recommendations.
  • To find the recommended tire pressure for your trailer, check the driver’s side door jamb for stickers that display tire size, rim, and the recommended psi for both single and dual tires.
  • Regularly monitor and maintain your trailer tire pressure to ensure safety, even wear, fuel efficiency, and proper weight support.
  • Underinflated tires can lead to reduced load capacity, heat buildup, poor handling, uneven radial tire wear, increased fuel consumption, and more.

Traveling with a trailer is such a fun thing. However, if your trailer tires don’t have enough air pressure, then the fun trip will turn into a sad trip. You definitely don’t want that, right? So, how much air should be in my trailer tires?

How Much Air Should Be In My Trailer Tires

Air In Trailer Tires

Well, answering this is kinda tricky. Because it depends on some factors. But In general, your trailer tire air pressure should be 50 and 65 pounds per square inch (psi). This is the perfect tire inflation to travel around. If you can make your tire pressure around that, then you can avoid tire failure and enjoy safe traveling.

But how much air for trailer tires? What should the tire pressure be on a trailer? Why is air pressure so important? What happens if you neglect it? Dig in to get all the answers about those.

How Much Air For Trailer Tires?

So, how much air for trailer tires or  how much air do I put in my trailer tires? Trailer tires need lots of air, usually 50-65 psi. However, the limit depends on the type of trailer tires you are using. Such as there are differences between air needed in mobile home tires vs trailer tires.

How Much Air For Trailer Tires

Just let me fill you up to the maximum number you find on the tire’s side. Look for letters like B, C, D, or E on the tire; they tell you how much weight it can handle and the air pressure that goes with it. If you have a C range tire (that’s common for boat trailer tires, ), it can carry up to 1,820 pounds, so stick with what’s written on the tire.

Don’t mess around with the max pressures. If your tire can take up to 85 psi or less, use that number. But if it can handle more than 85 psi, check what the tire maker’s chart says, and then add 25% for safety.

Before wondering, is 80 psi normal for trailer tires, or should you fill trailer tires to max psi?

Remember, keep an eye on the pressure regularly, and make sure it matches what’s on the tire. If you don’t, it can mess with how your trailer behaves and even safety. So, just keep it pumped, right?

Don’t just get into the psi I told you just yet.As you know, different trailer tires need different tire inflation. You need to know the right PSI to avoid the risk of tire failure. And how to know  how much air should I put in my travel trailer tires? That’s actually an easy peasy process if you follow the steps correctly:

  • Step 1: Look for your single axle trailer air specs – that means the right air pressure in the driver’s side door jamb. It’s where all the important stickers are for right tire inflation.
  • Step 2: In the door jamb, you’ll find stickers, and sometimes, they’re a bit worn if your travel trailer isn’t brand new. Don’t worry; it happens to the best of us.
  • Step 3: You’re going to spot two types of stickers: one like a square and one like a rectangle up top.
  • Step 4: The square one will show you your tire size, the stock rim, and the recommended max pressures for your tires. Don’t play around with  max pressures.
  • Step 5: When I talk pressure, I mean PSI – that’s what you’re going to pump into your tires. If you’ve got single tires in the back, it’s usually 75 PSI. If it’s a dual with four tires back there, it’s 80 PSI. Also, have a look at cold pressure.
  • Step 6: Now, look for the rectangle sticker lower down – every car should have this one. It should look like the one I’ve got here. It’s got info for the front and rear tires.
  • Step 7: It tells you the front should be at 75 PSI when it’s cold, and the back should be at 80 PSI when it’s cold.
  • Step 8: These are the manufacturer’s recommendations, and they’re a good starting point. But in practice, some folks find a little less pressure gives a smoother ride and fewer blowouts. So don’t be afraid to adjust.
  • Step 9: Now, check your tire PSI to learn what psi do I run my trailer tires at. You’ll need a handy tool – a tire pressure gauge. There are digital ones, but the old-school stick type works great, too. You can pick one up at any gas station.
  • Step 10: Just push the gauge onto the tire’s valve – it’ll pop up and show you the PSI in there. Easy as that!
  • Step 11: There’s another kind of gauge called a Slime gauge that you can find at places like Walmart. What’s cool about it is that it’s got a forward head and a backward one.
  • Step 12: The forward head is for your regular testing, but the backward one is super useful for dual systems.
  • Step 13: Dually means you’ve got two tires on each side in the back, and these can be a bit tricky to check. But the backward head makes it easy.
  • Step 14: If you don’t have a fancy extended valve like mine, you’ll need to push the gauge all the way in to check the pressure on dualies. With the extended valve, it’s much simpler.
  • Step 15: So, that’s the basics for checking and adjusting your tire pressure for your RV. The manufacturer’s recommendations are good, but you can fine-tune it for a smoother ride. Just remember to stay within safe limits.

Why Is It Important To Have The Correct Air Pressure In Your Trailer Tires?

You know how much air to put in trailer tires now. But why is it so important? Here is why:

  • Safety: It makes your trailer handle better and avoids tire failure, so you’re less likely to have a bad accident. Too little air can make you slide, and too much can mess with your grip. Especially if you want to pull a trailer behind your camper.
  • Tire Life: If the air is right, your tires wear out evenly. That means they last longer, and you don’t have to buy new ones as often.
  • Fuel Saving: The right air helps your trailer roll smoother, which means you use less gas. It’s like saving money with every trip.
  • Weight Support: Single axle trailers have a limit to how much weight they can take. If you go below the right pressure, you risk a blowout if you’re carrying too much stuff. When you want to pull a trailer behind a bumper pull camper that will weight support. That’s when perfect air pressure becomes so important.
  • Grip and Control: Proper air pressure gives you better traction, especially when the road isn’t great. It’s a big deal for keeping your trailer under control. Also perfect cold pressure safe you.
  • Handling: Your trailer handles better when the air is just right. It’s important for safe driving, especially when you’re turning or trying to avoid trouble.
Correct Air Pressure In Your Trailer Tires
  • Heat: Low air makes your tires heat up more, and that can lead to them going pop. The right air keeps them cool and safe.
  • Laws: Some places have tire pressure legal information for utility trailers. If you don’t follow them, you might get in trouble and pay fines.

So, for your safety and the safety of others, and to keep your tires and trailer in good shape, always check and keep the air pressure where it should be. Follow what the tire maker and the numbers on the tire say, and you’ll be good to go.

What Happens If My Trailer Tires Are Underinflated Or Overinflated?

Knowing how much air for trailer tires is so important. There is a reason for it. Underinflated or overinflated can lead to happen if you neglect it. Here is what can happen:

Trailer Tires Are Underinflated

Underinflated Trailer Tires:

  • Can’t Handle the Load: When your trailer tires are underinflated, they get weak and wobbly. This is bad news if your trailer is carrying heavy stuff because it can lead to tire disasters like blowouts. The load capacity is different in types of tire and torque specs. Such as mobile home and trailer wheel torque specs have different capacities. So have a clear idea of what you’re dealing with.
  • Hot Trouble: Underinflated tires act like a heat machine. They get super hot because they have to work extra hard, and that heat can wreck the tire, even making it fall apart.
  • Wonky Handling: Low vehicle tire cold pressure means a bad grip on the road. It’s like your tires are skating, making your trailer harder to control and slowing down your stopping.
  • Tire Fashion Disaster: Under inflated tires wear out in strange ways. They don’t share the weight evenly, so some parts get bald quicker than others, which means you have to replace them sooner.
  • Guzzling Gas: Underinflated tires create more drag, so your towing vehicle has to drink more gas. It’s like making your wallet cry at the pump.

Overinflated Trailer Tires:

  • Rocky Ride: Overinflated tires turn your smooth ride into a wild roller coaster. It’s like you’re bouncing around, and it’s not fun. Plus, it can mess up your trailer’s suspension.
  • Slippery Slope: Too much air in your tires means less tire touching the road. This is bad news in the rain or on slippery surfaces; you could lose control.
  • Fragile Tires: Overinflated tires are like balloons about to pop. They’re not good at handling bumps or sharp things on the road. Potholes and debris could ruin your day.
  • Shorter Lifespan: If you go overboard with air, your tires wear out faster, and they don’t wear evenly. So you’ll end up spending more on new tires sooner.

What Are The Common Tire Pressure Issues?

Handling tire pressure is never an easy thing to deal with. Whether it is mobile homes wheels or trailer wheels. Tire pressure is the most complicated thing to do. You never can do it right at first. So, facing issues in this isn’t something new. Here are some common issues:

Tire Pressure Trouble 1: Pesky Nail Stuck In Your Tire

You know what’s a bummer? When you’re cruising, and a nail decides to hitch a ride in your tire. Your tire sidewall starts hissing out air, and that pesky low tire pressure light gives you a scare. But no worries, it’s not a huge deal.

Quick Fix: Budget-Friendly Tire Service

So, for a nail in your tire, you can usually dodge a major headache with a wallet-friendly tire service. The pros can handle it. They’ll yank that nail out, patch up the hole, and pump your tire back up. Easy peasy, and you’re back on the road in no time.

Tire Pressure Trouble 2: Wonky Wheels Or Busted Rims

Sometimes, low tire pressure isn’t just about a little air leaking out. If your ride feels wonky and you’ve got low tire pressure, your wheels or rims might be acting up. That can spell trouble for your tires and even worse problems if you ignore it.

Quick Fix: Wheel Straightening Or Rim Rescue

To the rescue! Experts can work their magic on bent wheels or rims. This service saves your tires from more wear and tear, and it brings back that much-needed air pressure. Plus, it’ll make your drive smoother, save you some gas, and up your ride’s performance.

Tire Pressure Trouble 3: Time For A Tire Top-Up

Here’s the simplest one. Sometimes, that tire pressure light is just giving you a nudge, saying, “Hey, time for a refill, buddy!” It’s like your ride’s way of saying it’s thirsty for some air.

Quick Fix: Tire Refill

Now, don’t go overboard or too lax with your air pressure. That’s a recipe for a flat tire. Keep it balanced. You can check it with a gauge or let the pros handle it. Sometimes, you can even score a free top-up when you’re getting something else done. Like, when you get an oil change, they often give your tires a little checkup.

Tire Pressure Trouble 4: Weather’s Playing Tricks

Weather likes to mess with your tire pressure. When it’s chilly, your tire’s air gets shy and hides. Warmer weather puffs them up a bit. It’s not a huge problem, but it’s something to keep your eye on.

Quick Fix: Give Your Tires A Little Pep Talk

When the temperature’s doing its thing, your tires might need a pep talk in the form of a refill. The pros got your back. They’ll leave some room for mother nature’s mood swings. Your car should give you a heads up about this, but it’s good to remember when the weather’s being moody.

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Safety Tips For Checking And Adjusting The Air Pressure In Your Trailer Tires

Checking and adjusting the air pressure in your trailer tires is crucial for safe towing. Here are some safety tips to keep in mind:

Safety Tips For Checking And Adjusting The Air Pressure In Your Trailer Tires
  • Use the Right Tools: Use a high-quality tire pressure gauge to check your tire pressure. Ensure it’s appropriate for the PSI range of your trailer tires. If you are using a Subaru forester to tow a camper trailer then it will require a different tool. So, know before doing anything.
  • Check When Cold: Tire pressure can change when the tires are hot from driving. To get an accurate reading, check your tire pressure when the tires are cold.
  • Refer to the Manufacturer’s Recommendations: Consult your trailer’s manual or the information provided by the tire manufacturer to find the recommended PSI for your specific trailer and max load.
  • Check All Tires: Don’t forget to check all the tires on your trailer, including the spare tire, if you have one.
  • Valve Caps: Make sure all valve caps are in place and secure. These caps help keep dirt and moisture out, which can affect tire pressure.
  • Avoid Overinflation: Over inflated tires can be just as dangerous as underinflated ones. Follow the recommended PSI guidelines to avoid this issue.
  • Monitor Load Capacity: Make sure your tire  load capacity can handle the weight you’re carrying. Check the load rating on the tires and ensure it matches your trailer’s load.
  • Inspect for Damage: While checking the pressure, visually inspect the tires for signs of damage, such as cracks, cuts, bulges, or punctures. Replace damaged tires immediately.

Remember that proper tire maintenance is a critical aspect of safe trailer towing. By following these safety tips and regularly checking and adjusting your tire pressure, you’ll help ensure a smooth and secure journey.

Frequently Asked Questions

What Ply Is Best For A Trailer Tire?

For a trailer tire, go for a higher ply rating, like a 10-ply. It offers more strength and durability, which is ideal for handling heavy loads and long trips. It’ll help prevent blowouts and make your towing experience safer.

Is There A Standard Tire Pressure For All Trailer Tires?

No, there isn’t a standard tire pressure for all trailer tires. The correct tire pressure depends on factors like the trailer’s weight, tire size, and manufacturer recommendations.

How Often Should I Check And Adjust My Trailer Tire Pressure?

You should check and adjust your trailer tire pressure before every trip or in one mount, especially when your tires are cold. Regular checks ensure safety and help prevent issues like underinflation, which can lead to blowouts or poor handling.

What Tools Do I Need To Check And Adjust My Trailer Tire Pressure?

To check and adjust your trailer tire pressure, you’ll need a few key tools. Firstly, grab a reliable tire pressure gauge that suits your trailer’s PSI range. You’ll also want a source of air, like a portable air compressor, to add air if necessary.

Can I Use A Regular Tire Pressure Gauge For My Trailer Tires?

Yes, you can use a regular tire pressure gauge for your trailer tires. It’s compatible with the PSI range of your trailer tires and provides an accurate reading. It’s a simple tool that can help you keep your trailer tires properly inflated.


Now you know how much air should be in my trailer tires and how full should I fill trailer tires. So, now you just have to follow those rules correctly. Maintain tire reliability: follow recommendations, check pressure, and address issues promptly. These simple steps will contribute to a safer and more enjoyable towing experience, allowing you to hit the road with confidence and peace of mind.

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John Little

Written by

John Little

Meet John Little, the Tiny Living Guru. With two decades of hands-on experience and an architecture degree, he’s a Sustainable Housing Innovator and Tiny Home Ambassador. John’s mission: inspire eco-conscious, mobile living. Join him on this transformative journey.

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