I will use hose clamps on aluminum but stopped using them on my steel tanks after seeing how much the tanks swell with a good cave fill. The stainless in the hose clamps isn't as flexible as the tanks are. I heard of a failure deep in JB of a hose clamp and the subsequent nuisance of getting the tank out. I suppose having two would give you a decent backup, but would really slow down switching out tanks on out of town trips.

I also agree with Sludge that the scubapro style cam bands are a far superior design. Much easier to use, simple to rethread and they hold so much tighter. The shop I used to work out of in Texas sold them for a great price, I just wish I had bought more before I left.