I'm planning on getting a new stand for my 55 gal, and i think the best way to move a large tank is to empty everything. Take all the plants out carefully along with rocks, driftwood and other decor, then take the fish out (put them in air cushioned bags), you can probably ask a chain store or LFS or a few bags. I'm sure they wouldn't mind giving you some. Remove water and substrate last, it's not worth the risk of carrying a large tank with weight at the bottom. I did that with my 10 gallon and passed off lucky but I don't think I'll ever be doing that again.