Tandem 4400 lb axles = 2200 lbs per tire now add a good 15 percent reserve capacity = around 2500-2600 lbs per tire.....or use the trailers GVWR and divide by four.
The Bridgestone R-250 and and the higher cost Michelin XPS Rib are both all steel ply carcass commercial grade tire. They are heavy and best suited for heavy loads.
The Firestone Transforce HT is a ply carcass tire and make a excellent tire for trailer use.
Either of the 3 tires you mention will hands down beat a ST tire in this weight range.
I get 50k-55k miles 6-7 years of trouble free service from LT235/85-16 E Firestone Transforce HT on 6k axles and LT215/85-16 E BFG Commercial HT on 5.2k axle on my rv and other trailers.
Cooper Discoverer HT-3 and Goodyear Wrangler HT are both poly carcass tires with lots of rv and non rv trailer users.
Pulling heavy equipment/enclosed trailers for over 1.2 million miles has show me heavier tires last longer than a light weight tire ""when carrying loads"". They seem to take abuse better....However for your smaller trailer a poly tire works great.
Goodyears Endurance has only been out for just over a year now so its gonna' take several years of service to see if Goodyear has a winner.
