FWIW, Most of my knowledge is with MH's, but I've jumped ship to the 5'ver side of things. I own two, a smaller 28ft with a slide, and an older triple slide that I leave south which takes the blunt of the salt air where we winter.
Now that older one came with Michelin LT tires that has a slight amount of cracking (I only pull it 50 miles a season from storage.) Point of my story is if you could see how wide those cracks get when those tire flex (even just a little turn, without skidding into a spot)you might not buy everything you hear on this forum about the greatness of LT sidewalls.
Now I just put new tires on my smaller traveling 5'ver. I went with my mechanics advice of ST's and his comment that he hasn't had any problems with them. Small town so word would get out fast. Time will tell how they hold up.