Specifies which weapon this unit uses when it is inside a VehicleType with OpenTopped=yes set.
0=Primary,ElitePrimary,Weapon1,EliteWeapon1
1=Secondary,EliteSecondary,Weapon2,EliteWeapon2
2=Weapon3,EliteWeapon3
3=Weapon4,EliteWeapon4
4=Weapon5,EliteWeapon5
5=Weapon6,EliteWeapon6
6=Weapon7,EliteWeapon7
7=Weapon8,EliteWeapon8
8=Weapon9,EliteWeapon9
9=Weapon10,EliteWeapon10
10=Weapon11,EliteWeapon11
11=Weapon12,EliteWeapon12
12=Weapon13,EliteWeapon13
13=Weapon14,EliteWeapon14
14=Weapon15,EliteWeapon15
15=Weapon16,EliteWeapon16
16=Weapon17,EliteWeapon17
17=Weapon18,EliteWeapon18
18=Weapon19,EliteWeapon19
Seemingly by default, a full "gattling" cycle works and can use all 3 ground and 3 air weapons from inside a vehicle which has OpenTopped=yes without discerning "which weapon" is to be used
(Yuri's Revenge Only)