*I have forklifts but this is in the office where they don't fit through the door! This rental might be the answer. It says only 1000 lbs. but one on each side of the tank should work. Or the other option is to just have the tank out in the open in the warehouse & use the forklifts!
That would work. Just make sure the tank stays as level as possible throughout the lifting. A tank this size almost require mechanical assistance. You'd probably need about 12 men