So there are 3 Pelican drop sites: 1 on each side of the map to spawn vehicles for the respective team and 1 in the “middle” of the map.
The issue with that middle spawn site is that one team DOESN’T have to go through a bottle neck and lose their sniper’s line of sight from their base and the other team DOES. This makes it so going for the middle spawning vehicle is riskier and harder to get for one team than it is for the other team.
If a vehicle is gonna spawn there it cannot be a tank because you basically are just deciding who wins…