How old is this tank? I wouldn't try it unless I was going to use new sand or the tank was less than 6 months old. The second you start putting water back in the tank your gonna disturb a whole lot of bad stuff in the sand, which will cause a spike in just about everything.
That was my question! Old sand is bad, dirty, foul, grey water, sulphur stinking stuff. Even at 6 months. I would trash alot of the sand, or deal with the algae bloom that is sure to follow your move.
When I have moved tanks in the past, I tossed 50-70% of the water. I made new water at the new site before hand, pre mixed, ready to add to the tank. We used rubbermaid totes filled no more than 50% full. Like Dave said, the sides won't blow out, but the handles will shear off. You can fit your live rock into a few totes first, like a jigsaw puzzle, so they are as low in the totes as you can get, then ad enough water to cover them. Then add to the tank, and then add the new water. You only need to keep enough of your old water to, 1: Not shock the system, 2: Keep your corals/live rock/livestock wet (you could move your corals dry for 1/2 mile). A half mile move is pretty easy (compared to a long move, no move is easy).
Regardless of what you do, have water ready for large water changes. You WILL have a nitrate problem, and you will go thru a fresh cycle. No matter what. Unless you mvoe the tank full :p
As far as the plumbing goes. Now is a great time to add unions lol. 3-5" away from all hard parts, so you can cut them out if needed.