Family of four full-timing...RV recommendations?

28' is going to be crowded but people have done it with less.

Full time RV living for a family requires a lot of gear, food, and clothing. Make sure you understand that everything in the truck (including the family) other than the driver is subtracted from the tow rating. It is going to be mighty hard to find something that can be used with a 1/2 ton truck. Half tons usually run out of payload very quickly.