Later war panzers, did have them, although I must say most of photographic evidence there is mostly the mounts or provisions for them. I suspect, when not in use, they likely were stored in the Panzer itself. An example of this I know for sure, is the MG34 the StuG's carried. It was not a fitment until the Ausf G's maybe some F's, up to that time they were stored inside for local defence. A design shortfall StuG crews were quick to remedy, no small wonder since the StuG was designed to support the Infantry at least to start with.
Bob out
