Adenylcyclase

Hi NV enthousiasts, I’m new here. I’m a tall guy, 6’6´´, and the NV seems to be the only van comfortable for me. I want to make a basic camper out of it: insulate the cargo area and build a bed platform. I will be carrying bikes and sport equipment. Nothing crazy heavy. What is your opinion about the 2012 NV 2500? Should I go with the V8 or the V6? Looking for used ones with about 150 000km. And about the wheel-tires, how big can I go with the stock suspension, no lift? Thanks in advance