Many years ago when we had one of our gas motorhomes (can't remember if it was the V10 or the 8.1)I saw a gas MH driving into the RV park in the Colorado Rockies pulling a full size van. We've always limited ourselves to a small wagon (pre-suv days). So Wow, I went over to start a conversation and see how they got along towing the van. Anyway, they were just pulling into the RV park from the shop a few miles down the road since they had to have the transmission on the RV replaced...burned it out. They were going to have to drive the rest of the vacation in tandem.
Anyway, I'd advise against.