If off-roading it with a 4x4 package, I wonder about the Rickson Wheels DRW to SRW conversion, which replaces two wheels with one 19.5" that can handle the same weight. It might be an idea.
I wish more people made those here in the US. There are at least three (four counting Sportsmobile) upfitters (Quigley, U Joint Offroad, and Quadvan), so I'm actually surprised that some RV company isn't making 4x4 "C"s at a decent price point here in the US.
This isn't rocket science. The price difference for the upfit to 4x4 is about the same as going to a Sprinter chassis, and from there it is almost identical the upfitting needed. I'm amazed that only Phoenix Cruiser offers 4x4 as an option, when this would come in handy for virtually any person with a class "C".