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.
An inspection of a Dextero DHT2 sidewall DOT code shows that particular tire (manufactured in mid-2014) was manufactured by a Giti factory in Fujian, China. They currently feature two tire models, the Touring All-Season DTR1 and the Highway All-season DHT2 for light trucks (LT) and SUV/CUVs.