I might not understand correctly how Cliff has his tank mounted. I was thinking an elevated platform like with a deck where the tank sits. If you just use a hoist centered over the tank, it seems like you might need an extra set of hands on a tag line to pull the tank away from the platform deck so you could lower it to the ground.
I guess if he has a deck and the legs aren't in the ground and rather the deck frame sits on the ground, he could hoist the tank off the deck, pull the deck out, then lower the tank straight down and then reverse the process.
That's how it's setup now, on a 3' high deck that sits on the ground - the posts aren't in the ground. For stability & grounding the tank's strapped to a 2 1/4" pipe driven into the ground next to the deck. I've been thinking of adding a ramp to the front and a frame around the rest of the deck high enough to hang a pulley ~8" above the tank and a hand crank winch on the back side. When empty, I can lift the tank off the deck. When full, set the tank at the bottom of the ramp, run the cable through the pulley and crank the winch. That'll pull the tank up the ramp onto the deck.
I should have gone with a battery operated device like the one in dogmush's link to begin with. Now that I'm a couple hundred $ into this, I'd like to make it work. Well, make it work [i[better[/i].
