As to whether it can roll around and do damage I could not say if there is enough weight behind it but I expect it would take quite a bit of force from acceleration or braking or even turns for it to move that hard. Unless the tank is near empty and float is hanging close to the bottom there is not much else for it to hit. Noise from the lock banging on a side or knocking any old rust flakes off might be the more prevalent complaint.
Here are photos of the inside of a 47 and 48 tank posted a few years ago. I don't remember who took the 48 but I believe the 47 photos were supplied by Wes Boyer.
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48 gas tank inside.jpg (107.77 KB)
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