Okay, so here are some pics (since I know you all love them) of us unloading the tank.
I had this idea that we could plane some 2x4's down slightly and slide them into the slots in my crate base. As we would pull the crate out, we could slide another board in and a guy on each end could carry it comfortably forward.
Here's how it went:
In the third picture you can see the dolly setup that I built to hold the tank and make it manageable in my garage. Each dolly can hold about 450lbs...so 3 of them should be good to go.