Tire Load Range for Camper Vans: Matching GVWR

Why load range matters for a camper van

A camper van carries far more than its original curb weight: water, batteries, cabinets, and occupants all add up. The tires are the only contact with the road, and each one must support its share of the total weight. The federal motor vehicle safety standards define load rating as the maximum load a tire is rated to carry for a given inflation pressure, as you can see in Standard No. 109.

Load range is a traditional classification that groups tires by their load capability and construction strength, but the number that matters for your van is the maximum load rating printed on the sidewall. You need to match that rating to the gross axle weight rating (GAWR) of your vehicle, not just the total gross vehicle weight rating (GVWR).

• Check the vehicle certification label for GVWR and GAWR.
• Weigh your camper with all supplies and passengers to find actual axle loads.
• Ensure the sum of the tire maximum load ratings on an axle is at least the GAWR.

Rules for camper vans under 10,000 lbs GVWR

Most Class B and many Class C camper vans have a GVWR of 10,000 pounds or less. FMVSS 110 sets a clear requirement: the vehicle maximum load on the tire must not be greater than the maximum load rating marked on the sidewall. It also states that for multipurpose vehicles and trucks, the sum of the maximum load ratings of the tires fitted to an axle must not be less than the GAWR for that axle.

This standard also defines a passenger car tire as one intended for use on vehicles with a GVWR of 10,000 pounds or less. Many camper vans move to LT-metric tires because those are specifically designed for light trucks and vans, but passenger car tires can still be used if their load ratings are adequate. The key is to read the sidewall and compare ratings, not to assume a tire is suitable just because it fits the rim.

Camper vans above 10,000 lbs GVWR

If your camper van has a GVWR above 10,000 pounds, FMVSS 120 takes over. That standard requires the sum of the maximum load ratings on each axle to be at least the GAWR, and it includes a special rule: if you fit a passenger car tire to a truck, bus, or trailer, you must divide its load rating by 1.10 before comparing it to the axle requirement. This derating rule pushes most heavy van conversions toward LT or commercial tires.

Commercial tire sizes such as 17.5-inch and 19.5-inch are common on larger motorhomes and heavy vans. Standard No. 119 covers tires for vehicles over 10,000 pounds and includes endurance and strength tests that account for higher loads. If you are planning a conversion that pushes you past the 10,000-pound threshold, choose tires that meet the requirements of that standard.

Sidewall stiffness and ride comfort

A higher load range tire typically has a stiffer sidewall and requires a higher inflation pressure to support its load rating. That stiffness helps prevent sidewall flex under heavy loads, which improves stability and reduces heat buildup. But it also makes the ride harsher and can transmit more road noise into the cabin, especially if your van has a lightweight rear overhang. See what is tire load range for a broader overview.

You should not inflate a tire beyond its maximum permissible inflation pressure to gain extra load capacity. The load rating is defined at that maximum pressure, and exceeding it is unsafe. If your calculated axle load needs more capacity than the current tire provides, step up to a higher load range tire or a larger size rather than increasing pressure.

How to choose the right load range for your build

Start with the manufacturer's certification label on the driver's door pillar. It lists the GVWR and GAWR for your van. Next, weigh each axle with the van fully loaded for travel. If the scaled axle weight is close to the GAWR, you still need the tire ratings to meet the GAWR, not just your measured weight, because the standard uses the vehicle's rated capacity.

Look at the tire sidewall for the maximum load rating at the recommended cold inflation pressure. For LT tires, the load range symbol (such as C, D, or E) gives a quick indication of relative capacity, but the exact load index number is what you use for comparison. If you are upgrading from factory passenger tires, our light truck tire guide can help you spot tires built for heavier loads.

Do not forget the spare. A camper van often carries a spare tire, and it should have a load rating that supports at least the heaviest axle when you are forced to use it. Check the spare's maximum load rating before a long trip.

What to pick for your camper van

Questions

What is the difference between load range and load index?

Load range is a traditional letter-based classification (C, D, E) that indicates a tire's relative ply rating and construction strength. Load index is a number that directly specifies the maximum load a tire can carry at its rated inflation pressure. For safety, use the load index or the maximum load rating printed on the sidewall, not just the letter.

Can I use passenger car tires on a camper van?

Yes, if the combined maximum load ratings on each axle meet the GAWR. However, many camper vans are heavy and LT tires are safer because they are built for higher loads and more durable sidewalls. If your GVWR is over 10,000 pounds, FMVSS 120 requires you to derate passenger car tires by dividing their load rating by 1.10.

How do I find the GVWR and GAWR for my van?

The vehicle certification label, usually on the driver's door pillar, lists the gross vehicle weight rating and the gross axle weight rating for the front and rear axles. You can also find this information in the owner's manual. Always use the GAWR for tire selection, not the GVWR alone.

What happens if my tires are overloaded?

Overloading a tire causes excessive flex and heat buildup, which can lead to blowouts, tread separation, and uneven wear. The federal standards are written to prevent overloading by requiring that tire ratings exceed the axle ratings. If you are close to the limit, step up to a higher load range tire or adjust your build weight.

Do I need a higher load range for a lifted camper van?

A lift does not change the weight of your van, so the load range requirement remains tied to the GAWR and actual axle weights. However, a lift can affect wheel alignment and tire scrub, so you may need to check fitment and inflation pressure. The load range should still match the load, not the ride height.