A half hour trip is almost too short. If it was three hours, you'd be forced to be very deliberate. If it was across the room, you just throw it back together as fast as can. You're right in between. You could also, conceivably, bring most of the tank water with you.
The things I'd sweat the details on
1) having 30-40 g of premixed, correct temp, saltwater on hand
2) an ammonia badge, prime, and a bottle bac starter, big bag of carbon
3) A level floor with adequate outlets
4) A plan for the sand. Either a method of getting water back in the tank without disturbing it, or a quick and ready method for rinsing/replacing it.
That's really where it can all go wrong for you... The sand gets massively stirred up and all of your livestock is sitting on the floor in buckets, cooling down for 6 hours. Who can say if the sand is toxic in this instance or not? I can't, but it's not what you want.
Also, I'd not connect the ATO on day one. You'll be acclimating like crazy, removing and adding water. You'll also probably have to re-tune the overflow. Install the ATO once that's all settled.
Well, I could drive around for a while...

I think I've decided against using the existing sand (thanks to
@brandon429 for the great info!) So, I think this is my plan:
Pre-Move
0) Purchase everything - RODI, salt, sand, test kits, extra heaters/pumps for salt mix, etc.
1) Mix enough saltwater to fill tank & sump + extra (~100 gallons total)
2) New sand rinsed and ready
Move Day
3) Catch fish, place in separate, small containers with tank water
4) Place corals in separate, small containers with tank water
5) Place rock in larger containers with tank water
6) Drain tank, remove sand and move everything to my house
7) Clean tank of any leftover sand/uglies (tap water, vinegar, rinse with RODI water)
8) Setup tank, level, etc.
9) Fill with new water and new sand (ensuring still level)
10) Swish rocks around in old tank water to remove any extra detritus, etc. (quick rinse in new SW?)
11) Place rocks and coral in new tank
12) Turn on pumps, etc. and make sure everything is working
13) Acclimate fish to temp, drip acclimate new tank water and add to tank
14) Monitor, test, etc. Enjoy tank!
More questions - would it be better to leave corals on the rocks or remove them for the move? Would I be better off moving the fish/shrimp into a temporary tank? I could pretty easily get a 10 or 20 gallon tank set up, similar to a QT, to get the fish in right away. Then I can run the DT for a day, a week, whatever to be sure everything is good before moving the fish in.