It takes many hours of researching the various regulations and industry standards to get on solid ground with tire pressures and where the recommendations come from.
I’ve written numerous blog and internet forum posts about recommended tire pressures. They are always challenged to some degree. It is a subject with a mind set and it’s very difficult to penetrate some mind sets.
When I post information about recommended tire pressures I do it from the industry accepted perspective. The industry must follow the written government regulations. Researching those regulations is tedious and a certain amount of experience is very beneficial to the researcher.
Because there are more than one standard to follow the RV trailer owner is often bewildered because what they have known about their automotive vehicles tires may not be acceptable for their trailer tires.
One thing that is standard across the board is where the recommended cold tire pressures come from. By DOT regulations the only authorization for tire pressure certification is the vehicle manufacturer. When they put a figure on the vehicle’s certification label it becomes the minimum standard for correct tire pressure (s) for that vehicle. Sure, there may be exceptions and deviations. They will be found in the owner’s manual.
RV trailer owners that decide to manipulate their tire pressures below the vehicle manufacturers recommendations are the people you pass parked on the side of the road waiting for roadside assistance to help change their failed tires. Here again there are exceptions. Not very many though.
There is only one good thing to do about your tire pressures on your RV trailer. Get your trailer weighed. Insure no tires are overloaded. Insure your trailer is loaded under its GVWR. And make sure your tires are aired to the recommended cold tire pressure (s) found on the tire placard, vehicle certification label or owners manual.
Here is an up-to-date reference with loads of good and useful tire information. Chapter four is all about Recreational Vehicles. It is worth noting that the RMA mimics the industry standards for NEVER using less tire pressure than what is depicted on the vehicle’s labeling.
http://www.rma.org/tire_care_info/ti...e%20manual.pdf
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