I just moved a 75 gallon 30 minutes away to my new house. I didn't lose a thing.
What I did:
Bought a bunch of plastic tote-like containers (about 15 gallons ea).
I unplugged everything, starting draining it out into the assorted containers (I had about 10).
As they were filling, i was putting rock in them so the rocked stayed submerged in water the entire time. My friends were loading them into the truck as they filled.
Once the water level was low enough for me to trap the fish, I grabbed them and put them in bags, floating them in the water of one of the containers. Same with the inverts.
When I had 1" of water left covering the sand, we very carefully moved the 75 gallon tank and then the stand. Was careful not to kick up the sand too too much, but it was pretty much inevitable.
Got to the new place, started filling up the tank, adding rocks as the level got higher. the problem was, the sand just was kicked up so much, that I couldn't see into the tank at all and I was placing rock in the blind! Once it was filled with rock & water, I added the creates back in. By now, the temp had dropped 10 degrees.
It was cloudy for about 15 hours, but when it cleared up, everything was alive and the rock placement wasn't too terrible! i placed a couple of corals face down, but ended up rescuing them.
I did d a water change about 3 hours after the move (had the water made & ready), so I think that helped. I also used a lot of this stuff I got at the lfs that helps neutralize ammonia levels.
The key is to move it quickly, but not so quickly that you are reckless
Any more q's, feel free to ask, like I said, it was very successful for me
alex.