I don't keep mine running while in storage - do the same as RK911, I stage it in my driveway before going and after returning. Its always hard to put it back though...
Not many places are going to have electric, but you can always check your local area and ask people who have unused space such as a barn. I used to rent a garage for a few of my classic cars. Besides, the stuff you want to keep cold like ketchup seems to be just a waste of enegry - why pay to keep condiments cold between trips? Realize that this is your normal routine, but routines sometimes need to flex. Hopefully, you can stage the TT at your new home before a trip - then there won't be a need to continualy run it.
