You may have to make some compromises. Most Class B's don't have much ground clearance, and even the rare 4-wheel drive units may be better suited for driving on the beach than off-road. Older units often come with maintenance issues, so budget accordingly. Any kind of RV is less than ideal in harsh winter conditions, as they have very little insulation. Do your own research on what you can tow, since dealers tend to give out unreliable info ("Sure, you can tow this with your current vehicle"). Figure out what comes closest to your ideal, even if it's only for 3 seasons, and have fun.