I have not heard anything bad about the new Goodyear radials yet, but I don't think they have been on the market that long and I don't know how many folks who have blown up the old tires would buy the new.
I have load range E, fifteen inch tires on my 24ft enclosed and have not had any problems yet, but they have not been tested in the heat that much.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
That all being said, from what I have heard the 16":rims are really the ultimate solution to the problem.
Good luck and keep us posted.
Bill