I'm also looking potentially moving soon. Possibly trading the west coast for east in the next year, and have been contemplating the move. I think the majority of my fish are going into a 5-Gal water bottle (like from a office water dispenser, i.e. Culligan's, etc.) My thought process is it can be filled really close to the top minimizing virtually all thef road slosh in the process. A container full of liquid transfers almost no inertia into the liquid (if you've ever tried spinning a raw egg, you know what I am talking about). The top will be relatively easy to cap, while allowing air tube to be introduced, will accomodate quite a few fish for a few days anyhow. Start by transferring tank water, then performing SWC's each day on the road, pumping out waste materials. Maintain temperature with vehicle's heating/cooling system, and cover with a towel to keep from over-stimulating the fish, or exposing to sunlight, which can elevate the temperature in reatively sealed/covered water really quickly.