Galaxy Question: Yes there are 2 gunner seats next to the driver and one gunner behind the driver.
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here th answer your locker question.
No maximum on the vehicles although unusd vehicles dissappear if not hacked or mouted for a time.
Yes you need darklit vision to see your cloaked teammates bodies, but you can always see their name, even if you can't see thier body.
No there is no empire 1 vs. empire 1 fighting, it is always NC v VS v TR