Wife and I are planning to full time for 3 years or more. We did this back in 1994 in a 40' American Eagle and had a great time. At that time we generally stayed in a park for several months moving from the north to the south following the weather patterns.
LT is not a tire rating but a category of tire. LT stands for light truck and as the name suggests, these tires are designed for trucks and SUVs. The label LT is usually placed in front of the tire size. The other common type of tire is a P tire.
I purchased 4 Michelin LTX M/S2 tires from costco. There is a 115,000 km warranty on the tires. I have put 38,000 kms on the tires and the rear have 3/32 (bald) and the fronts 8/32. When I took the tires to check about warranty I was advised that the tire were rotated wrong so they wouldn't warranty the tires.