Back in highschool I knew a guy whose family had one... they're huge, and a bit costly I'd imagine. If money was no object, I suppose that'd be traveling down to Cabo, and to all points in between, in one of those.
I worked near one of the MBUSA VPC's where they arrive into the US. I was a representative for the land owner, so I was able to visit for various reasons, basically whenever I wanted. The VPC had one for their operations, because Unimog.