Have to lug this tank into my basement and it easily weighs several hundred pounds. Soooo.......... I was going to pick up those Suction Cup glass movers from a hardware store or somewhere but I've looked online and it will say Weight Capacity is lets say 120 lbs. Now does this mean that it will ONLY hold 120 lbs regardless if I have 4 of them or does it mean 4 of them will hold 480 lbs for instance? Never used these before but I'm sure they will make my life a thousand times easier lugging this tank into my basement.