I looked for LT tires for my 1999 Pace Shadow that came with 215x75x15 inch tires and 6 lug 5000 Lb axles 4 or 5 years ago, none of the 15 inch LT tires had a higher load rating than the trailer tire had back then whiney scope
The way to get better rated trailer tires was to switch to 16 inch rims and tires shruggy

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)