"My trailer is 15,500 GVWR ,and there is no way in the world I'm running E rated tires"
I would have ZERO issue running the "E" @ 4,080# per tire on your RV that has a MAX weight of 3,100# per tire.
I would have ZERO issue running those tires up to max weight per tire any day!
So should I run a even higher rated tire on my DRV since I carry 18,300# on my 4 GY "H" tires? Perfect world that's 4,575# per tire. I will guarantee at least one tire is at that or over. I check my tires at every stop and they run nice and cool as does my oil bath hubs.
About 80 degrees at time of pic on sunny side of RV.