I had a relative tell me he got rid of his TT because all the cranking was hard on his bad back. When I told him about power jacks and using your drill to move the stabilizers, he looked at me like I had a tentacle growing out of my forehead.
Those vans are nice, but they don't go EVERYWHERE - not off-road anyways if you are exploring the West.
If budget is an issue, I'd either upgrade your existing trailer or look at a new trailer that has the features you want and is less an issue for your tow vehicle - or upgrade your tow vehicle too.
There are also nice vans that are not Sprinters for alot less money. I've seen big B's or C's on a F250 chassis that is also a pretty compelling package on a very strong platform.