Rover..if you wanted a 4 or 6 wheel drive RV, it's not out of range for most if you have mechanical skills. A person can install/build a rig. I, on the other and, have trouble tying my shoes, so I bought a rig that had been modified. Most joints will only work on new, but there is an outfit in Salt Lake City Utah and one in here BC, that will modify pretty much whatever the customer brings in. So..if a person had a C RV that they really liked, they could have the mod done for about $22,000. Lots cheaper than that Merc, you saw.
And yes..I love mine.

Here's a video I shot, driving up a trail in the Fraser Canyon
http://youtu.be/7ZsDmjS2XbUAnd thru a river...
http://youtu.be/FhANZhUG6WEGary Haupt