I just put Goodyear Endurance.... They are also heavier tires than other ST and LT tires in the same size.
The LT and ST in a 235/85-16 E are about the only two that are the same size.
Goodyear says the ST235/85-16 E weighs 44 lbs.
Goodyear also says their LT E Wrangler H/T weighs 50 lbs.
Michelin same size XPS Ribs weighs 56 lbs.
Bridgestone R-238 same size weighs 59 lbs.
BFG Commercial LT E same size weighs 45 lbs.
No doubt the new Endurance is a a lot heavier than the old same size Marathons at around 38 lbs. They should do well for rv trailer use.