tropic mica
1-Co-Pilot in helicopter:
UH-60/KA-60 (A.K.A. Cows): Give access to thermals in the bottom of chopper or maybe some sort of weapon there. Main pilot can give Co-Pilot the control, the main pilot gets access to some gadgets (non offensive like medkit, repair tool, binocularus, etc.). This will make more useful to choose medic or engineer than armored support. When Co-Pilot is replacing the main pilot, they cant use the thing that is in the bottom of the chopper.
MH-6/MI-34 (A.K.A. Birds): Give access to the entire loadout and immediantly takes control if main pilot wiped out.
2-Ground/Water vehicles` passengers:
APCs:
Make interrior and give access to loadout and let the passengers iteract with eachother and the vehicle. Example: 3 engineers repairing the APC and supports supplying the APC (supports could supply it only inside the vehicle).
Armored Cars:
Same as APCs but devs do not need to make the interrior.
Boats:
Look to the Armored Cars and APCs section
tawny verge