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As far as the weight of your trailer goes, exav8tr and TomS have given you the right advice. You need to weigh it while loaded for a typical trip. The ideal way would be to weigh the load on each individual tire, then use the heaviest loaded one as your guide. If this is not possible, you can weigh the front and rear axles individually, and use the heaviest axle weight divided by two as your guide. The most common way, also the least accurate, is to weigh both axles at the same time and divide by four.
The tires in question, size LT235/85R16 load range E, all have the same maximum load and inflation molded into the sidewall. 3042 pounds at 80 psi. There are however, differences in speed ratings and construction.
Michelin XPS Rib - Steel belts and sidewalls. Max speed 99 mph.
Bridgestone Duravis R250 - Steel belts and sidewalls. Max speed 99 mph.
Bridgestone Duravis R500 - Steel belts and polyester sidewalls. Max speed 106 mph.
Firestone Transforce H/T - Steel belts and polyester sidewalls. Max speed 106 mph.
BF Goodrich Commercial T/A - Steel belts and polyester sidewalls. Max speed 99 mph.
There is no law prohibiting you from switching to LT rated tires. Nor is there a law prohibiting us ( tire dealers ) from recommending, selling, and installing them as long as they meet the load requirements. A reputable tire dealer will go by the scale ticket you take him when making recommendations.
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