The BMP-2 when AI controlled and driving down roads at normal speed has a peculiar thing going on with the suspension. When spectated from the outside you'll notice as the BMP 2 gets up to speed the rear part of the chassis sags down and the front of the chassis aims up. It's almost low enough in the back that the chassis would be colliding with the bogey wheels.
It seems to be trivial game play wise as I don't see it causing performance issues with the AI or the ability of the vehicle to drive so it's not game breaking. It is however a bit strange, not sure if it's supposed to be doing that.
To test, just drop a BMP-2 on any road on any map in the editor, give it a "safe" behavior waypoint to a sufficiently far away point on the road, long enough for it to reach cruising speed.