I am not so certain that an actual Tank Town is needed in a map, but maps do need to be reasonably GV friendly.
Multiple spawn points, within reasonable driving distances are important to the GV'ers. Remember we are only moving at 25mph.
This might be a little off topic, and controversial, but, I would like to see there not be any level bombers at the small airfields. Limited runway space and lack of facilities, makes this realistic.
I can respect the guy that drops a bomb on my head from a F6F, (I don't like it), but the the guy in the Lancs formation sux.