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.
There are All-Terrain tires and Mud tires (M/T tires) that deliver high levels of traction in sand, mud, dirt or rock, so you can venture of off-road with confidence. Westlake also has winter tires. In northern climates you may opt for a second set of tires for maximum safety in the winter months.