For reasons unknown to me, tire manufacturers are often reluctant to print industry standards. Industry standards are normally a combination of government regulations and inputs from contributing agencies such as the RMA or T&RA.
By DOT regulation the manufacturer of your RV trailer is tasked with determining and setting the correct tire pressure for your Original Equipment (OE) tires. The correct tire pressure is depicted on the trailer’s federal certification label and is depicted as the recommended cold tire pressure.
Industry standards will not violate those recommended pressures for your OE tires or replacements of the same size and load capacity. When replacements are different in size and/or design new recommended tire pressures will be determined by the installer. The information for determining the new recommended pressures will be determined using the amount of load capacity the OE tires provide by their recommended pressure.
In the reference provided below you will see the emphasis placed on the words; “NEVER use inflation pressures lower than those printed on the vehicle placard.” That’s a reinforcement of an industry standard.
Click Here for the reference.FastEagle