During setup, can I place a gun that would otherwise be allowed to HIP on board under a "?" and keep the crew HIP? I could use a few more 5/8" "??" to obfuscate the position of my tanks.
That's not to say if you have "?" counters in your OoB that you couldn't mix and match size AND place the gun onboard under one of them as well to try and keep your opponent guessing as to placement.