I don't believe there are any motorhome areas as such, just 24 hour generator areas. The only place I know of that tents are not allowed is in the new "improved" areas with the electric and water hookups. Motorhomes can park pretty much anywhere they can find room, but motorhome, trailer, tent, or anything else outside the 24 hour generator area is not supposed to run them after certain hours. I would think that if someone insisted on running their generator after hours outside the 24 hr area, a call to security might be in order.
Also, I would have to review the map to verify, (and the updated Camp Scholler map for this year probably won't be available until shortly before the show opens,) but I believe there is a small area where generators are not allowed at all.