They make car power inverters so you can plug in a heat mat and a dimmer into it. It wouldn't make much since to get one for a one time thing but they can also be used for lots of other things such as plugging TV and video game systems etc for you or your kids for long drives to a vacation or something. I have the one in the link below.
I've used it for the reasons above and to transport herps. I leave it in my vehicle and if I'm going to a pet shop or somewhere similar I load up a dimmer, extra heat mat, and tub bc I never know what I'll come home with lol.
Also if you ever move far away you could power multiple setups including thermostats and everything right from your car as long as you stay within the power inverter watt rating.
Anyways here is the one I have.
http://m.sears.com/diehard-425-watt-...Q&gclsrc=aw.ds
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