I probably will fill it 5 times a year, so infrequently. And I don稚 have forks, and my grapple stays on my tractor, so it will have to be with a lifting sling or chain. So the only question is how to attach it to the tank or to be made, tank frame. The sticker on the tank warns not to pick it up when full by the rings, so I would be afraid to do that (although I値l bet it would work fine) but don稚 want to risk dropping it and damaging my tank or truck. As far as it swaying as it dangles from whatever, I知 not worried about that. I lift my other implements all the time to load them, some much bigger and heavier.
And I don稚 want to weld to the tank. It has diesel in it and my welding skills are minimal. It I知 good enough to weld a frame if need be.
I agree increasing the footprint to make it more stable during transport is a good idea.