Greg,
Thanks for the link to that great video of a Class C motorhome showing it's stuff holding it's own on roads that it shouldn't have been on in the first place ... clay desert roads after rain or thawing snow.
It was not the "small" Class C that I had in mine (it looked to be at least 26 feet - maybe 27 feet). However, the video beautifully demonstrated what the extreme weight on the rear drive wheels of a 2X4 Class C could do versus what the much lighter weight 4X4 pickups could do. The rear duals on the Class C probably gave it a bit more floatation on that soft surface than what the others had, too.