When I moved my fish tank, I put my fish (danios) into a fish bag like you would get at the LFS, drained as much of the water out of the tank as I could, scooped most of the sand into a washing up bowl and then chucked it all in the car. Got to the other end, set up the tank on the stand, put the sand back in, filled it, replanted the plants (I put them in a separate fish bag to keep them moist on the journey) used some boiled water to raise the temperature, got the filter and heater going and then re-acclimatised the fish, as the water was different.
No point in trying to take excess water with you - just make sure that your filter media is kept at least moist, if not in some water for the journey so that your bacteria doesn't die off en route