I think if somebody is going to go at it with a hacksaw, then you will not be able to prevent them from taking your tank no matter what you do. My intent is to prevent theft from an unsophisticated person who sees a somewhat expensive item that is unsecured and that can be taken with minimal effort. I would hate to be camping off the grid and be forced to return to civilization prematurely because a critical part of my set-up has been taken. Realistically I think it is improbable that somebody would steal it to begin with, but as I get older, I am also getting to realize that there are more unscrupulous people around now than there used to be. I would rather spend a little money up front to secure my equipment as insurance against something like this happening than have my trip ruined by some @$$hole.
My $0.02
Cheers,
Greg