hi all, in the near future i'm planning on buying a 10th generation suburban for this intended use: my girlfriend and i are going on a 6 month road trip throughout the usa. we are planning on sleeping in the vehicle most of the time (well, at night that is). we are going to take out all but the 2 front seats and we are not hauling much load - just minimalistic camping gear. we are planning on getting some a/t 33's on and don't go over 65mph. -with that in mind, what would be the best (lightest) model, best (fuel efficient) engine and the best gearing to look for? ...yes, i know - "light" and "fuel efficient" are not the usual terms for a suburban - but you get the idea. - as we want to camp quite a bit in national forests etc, we want a 4 wheel drive (no hardcore wheeling - we just don't want to get stuck on a forest road). now, is that correct that there are awd and 4x4 options available? how can i make sure i get a 4x4 with a hi-lo range? - also - is there room for a 2nd/house battery in the motor compartment? thanks a ton!!