I obtained a fiberglass tank about 10 feet in diameter about 6 feet high, dome top. First, I drained about a foot of water out of it. Then was able to lever, carefully, one side up and block it with wood, then other sides.
To load it on a trailer, I used a bunch of 4 inch wide trailer straps to make a cradle for it going to a single lift point on top. Straps under it as well as a strap around the middle to keep them from slipping .I was fortunate that there was a BIG fork lift in the area, the kind used to lift bundles of shingles on top of a several story building. I talked the operator into loading the tank for me after work one day. Don't know how much it weighs, but not as light as plastic and not toooo heavy, either. Big problem was the bulk and need to lift from a single point high off the ground. That fork lift had no problem with it.
I need to move it again now. Do not have access to the fork lift. Am thinking I will block it up with wood, drive low boy flatbed trailer under it.