Yes, I absolutely recommend taking a 2wd to QuadVan. Taking them a completed coach also means the springs and and shocks can be tuned for actual loaded weight. The Quigley chassis is spec conversion, so they try to get it "close enough for most rigs".
QuadVan will give you a shop tour if you happen to ever be in Portland. See I how they do things vs others is pretty eye opening.
I wouldn't hesitate to take a Phoenix Cruiser Offroad. It's well built with a full steel body cage. They wouldn't offer 4x4 if their coaches couldn't take the abuse.