J Brown - Because the engine and cab are a "Semi-Truck", like those used to haul freight. A motor home's designed to maybe last a few hundred thousand miles. This coach is built to last, it’s common to have a million miles on some of these machines. Not joking.
If you look at the beginning of the video again you can see the rig has the tractor and trailer of a semitruck and trailer. Since the trailer is so big it takes a big truck to drive. Nice rig but I miss Alyssa doing the video!
