I moved an established tank of this size about 8 mos ago (in the summer)
The trick with the deep sand bed is to remove it and put it in a pail with holes in the bottom, so it moves wet, but not standing in water. Before removing it from the tank, remove all the water you want to save ( I tried to save most of it) and then stir up the sand bed really well, it will stink and be
black and murky, now siphon off the sludge as much as you can and get rid of it. Now load up the sand into the pail with the drainage holes, and its ready to add back to the new setup. I didn't get any cycling after moving, and lost no livestock. I did do fairly frequent water changes for the first while
and tested water alot. The live rock I just transported in styrofoam boxed with wet newpaper over top. I guess the big concern will be keeping the temperature warm while transporting. Good luck and hope this helps. Karen