LT = light truck such as an SUV, pickup, etc. That is why it is illegal to install on a trailer.
Now your RV is worth lets say 20-80 grand. What do you think the guys towing those huge offshore tunnel hull catamaran style racing boats use? These boats are worth 100K to over a million bucks.
They are converting over to run flat tires which lets you keep on driving if tire goes flat. They don't explode into shrapnel when they go flat as they have an solid inner core that allows you to safely slow down and keep going slow to an exit or turn to change out your tire. Yes run flat tires are expensive but so is your RV.
Run flat tires are for cars and trucks, not trailers. You have to block up your RV and bring in the rims to an independent guy that will do this for you. RV dealers wont do it. Find out what size your RV tire is, then go to www.tirerack.com
and look for run flat tires in your size.
Just another option for you guys as ST tires from China we all know suck. Goodyear Marathon tires wear out very fast but they are a good tire. Carlise is brand I have had best experience with.
Go ask guys that tow livestock, horses, and those giant round bails of hay what they use also. Agricultural use is way more abuse than what a typical RV uses.