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.
Example: P225/50/R17 98H. P identifies your tire as a Passenger Tire. The P stands for PMetric. If your tire size starts with LT rather than a P than it identifies the tire as a Light Truck tire. 225 identifies the tire section width, which is the measurement of the tire from sidewall to sidewall in millimeters.