I will go with what Goodyear says rather than what someone posted on the internet!!!!!
Well according Goodyears RV website "weighing RVs" they say;
Goodyear Tire and Rubber .... weighing RVs
Special Considerations
**Unless trying to resolve poor ride quality problems with an RV trailer, it is recommended that trailer tires be inflated to the pressure indicated on the sidewall of the tire. Trailer tires experience significant lateral (side-to-side) loads due to vehicle sway from uneven roads or passing vehicles. Using the inflation pressure engraved on the sidewall will provide optimum load carrying capacity and minimize heat build-up.**
And if your using Carlisle ST tire then their warranty says;
Carlisle ST tire warranty;
-Maintain air pressure at the maximum PSI recommended on the tire sidewall.
-The Warranty is void if the tire or wheel fails due to damage from improper inflation pressures, exceeding the maximum speed limit, or overloading the tire beyond the maximum load capacity stated on the sidewall
However for those that over tire their trailer I've found this works best in that situation;
rvsafety.com
Tire Load and Inflation Ratings
Note: Towable – Travel Trailer/ 5th Wheel owners Due to the severe use conditions experienced by tires when axles are very close together – tire industry experts recommend maximum (sidewall) inflation pressure for towable tires unless this causes a sever over-inflation situation (20psi+), often referred to as the ‘basketball effect’. If this is your situation allow a 10 – 15psi safety margin above the minimum required inflation pressure.**