This will be easy for you. I have done it more times than i would like to admit.
Get some 5g buckets. Take one and place a small rock in it. Add water from your tank and put your livestock in there. Add batter bubbler or 12v if you have that in your vehicle. I added a heater too for my longer drives, but not the 5hr ones when i could control their ambient temp.
use a bucket for the sand, separate from anything else and cover in water.
Misc stuff in other bucket. When you setup, use as much of the old water as possible. Rinse the sand and put everything but your livestock in the new tank (kinda right?). Then drip acclimate your livestock and return them to their home.
you mar or may not have a mini cycle. I just drop in some booster bacteria and have never had a problem. I used to move my 29g reef once a year this way.