I use tires that gives my trailers a 15 percent reserve capacity so they can be ran at max pressure. Max tire performance and reliability comes at max pressures....according to Michelin truck tire anyways.
However when a trailer axle is over tired by 30% or 1280 lbs per tire max pressures may not work out the best.
In that case I like this from;
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.
On edit;
I run my LT235/85-16 G Sailun S637 with 3750 lbs capacity at max psi on my GN tri axle trailer with 7k axles.
