Over tiring a trailers wheels/axles and figuring what pressures to run is a hot topic. More tire may not be the best idea depending on loads and pressures from other components.
The benefit of the F tires over a E tire 80 psi come only at those higher 95 psi numbers.
Minimum pressure load charts are just that and work well with a truck/van/suv/motorhome with tires at the corners but not the best idea in the trailer world where the axles are close together and in the center of a heavy vehicle where loads are changing constantly while going down the road.
Loads on a trailer tires can change especially in strong side winds or road surface crowns.
Now add ply shearing issues when turning a corner. Max pressures insures cooler operating and the tire can hold its shape better than a derated tire with low pressures.
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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.
