I’m not convinced, sorry
The mystery item has straps on the outside that seem improbable for an inflatable raft or boat, and why would any tank in North Africa carry one even if it was? The tank merely being close to the beach would be an odd reason — would you pack a life raft every time you go to the beach? Even in an amphibious landing, carrying a life raft strapped to every tank doesn’t make that much sense, as it’d be much easier to rely on the landing craft’s.