Talk to RVer's that have been doing it for a long time and ask what type of RV's they have owned. Usually they will have a long list of different units. Might as well face the fact that you will probably have several different units over the years. I bought a 1 ton dually and have already changed my mind about what I am going to buy. At least I have a truck that has a lot of flexibility for towing/carrying. I have owned a camper, 5th wheel and travel trailer.
2005 Dodge Laramie, 4X4 Quad Cab, Dually, 8 ft Box,
3.73 LSD, BD Exhaust Brake, BD Torkloc & Autolok, MBRP Stainless Exhaust, PacBrake Air Suspension. 2007 Arctic Fox 990 Camper