It might not hurt to consider installing skid wheels on the hitch if this is something that happens often. Of course, the skid wheels lower clearance, but it helps mitigate any damage.
Some people buy/build an insulated curtain or divider between the cab part of the "C" and everything else. This coupled with some Reflectix under the mattress in the cabover does help keep things warm/cool when parked somewhere for a few days.
If in place for a while (weeks or more), 3M sells a kit that has clear plastic film in it and double-sided tape. I'd buy this and use it to seal the windows, giving dead air space. With a hair dryer, the sheeting will shrink, so it isn't as obtrusive. This can help immensely with keeping warm/cool.
Another thing to consider would be a Trik-L-Start device which will keep your starting battery charged from the house batteries if you are parked somewhere for a long time.