I've set (3) 600-800g tanks, and I use a pair of motorcycle jacks, a pair of hydraulic lift tables, and (4) furniture dollies to wheel the tanks around on their original pallets. I also use several 8" suction cups to shift them into position.
We never actually lift anything, other than when sliding the tank & pallet off of a trailor and onto the (4) dollies. After that's done, all lifting is done via the jacks & lift tables. Then we simply push & pull the tank into place once the tables are at the desired height.
WORK SMART, NOT HARD!
-Tim