Just an idea. Make vehicle depots repairable/capturable like airfields. It would probably be more important on larger maps to help the frontline shift as vehicles advance. Depots probably should not be able to spawn any vehicles for like ~5 mins after being repaired.
#Capturable Vehicle Depot
gentle herald
deft valley
I think they are supposed to be capturable, it's just not working right now. They have the toggle in the editor it just doesn't work.