I think that using heaters and airstones would be going a bit overboard, and that this move could easily be done without them. If you want to be extra careful you can get an inverter, that plugs into the cigarette lighter and gives you a couple standard electrical outlets to plug heaters and stuff into. If you do this, keep in mind the rock doesn't really need it. The key is to move quickly, but not to quickly where your cutting corners.
As far as the sand goes, the best thing to do is replace it, it won't do much for you and stirring it all up during the move can release a lot of nasty toxins. If your going to reuse it, what it out good...but you don't need to use RODI or saltwater, the hose will work just fine. Basically just take a bit at a time in a 5G bucket rinse it out while stirring with your arm and keep dumping the water until it becomes clear. Then just put the sand back in the tank, add some water, then the rock, then the animals etc... Don't let the rock sit out of water for any lengthy period of time!
You will also want to make plenty of fresh SW and have it ready and waiting for you when you get home, because you won't have enough to fill the tank back up completely with what you end up taking. Find out what the guy keeps the SG at so you can match it.