Re: After the fact conversion to 4x4
It depends on your Van not age. I just spent about 10k on my 4x4 conversion not including the transmission/transfer case (mine was a Quigley already) using a Ujoint kit and rebuilding both axles, converting to Hydroboost, new driveshafts, and 5 new 37x13.5-20's.
I plan on keeping my Van for a long time. It will not increase its value by 10k. Now as you are talking about a Sportsmobile not a Home Built like mine...
2001 RWB Quigley (not a SMB but love it)
Lots of Motorcycles (Dual Sports, Sportbikes and Sport Tourers)