I have seen a lot of post concerning more flak at bases,or tank destroyers etc.....until more of that becomes available how about a towable 88 flak(towed by the german halftrack already in the game) that can fire AP.HE,and AA rounds with proximity fuse,maybe smoke as well.
It would be easy to destroy as it is an open manned gun,but difficult to find .it would have no icon when deployed as man guns in the game have no icon. but when trailered it would have a std vehicle icon and can be spotted from air or tower,etc.
It would need time to deploy(like the re-arm pad takes time)maybe 30-45 sec. it could not carry supplies of any sort and no troops(halftrack would be used for ords and crew to operate the 88Flak
To deploy,use the O key to open doors and O again to deploy,and another key to trailer and O to close doors.
I know 30-45 sec is not a believable deployment time,and neither is 30secs to re-arm and re-fuel a plane or a box of supplies that can turn a tank back over from its side in 2 secs. but it is a game,and would work well,deal with it .