Benny needs to fix all the bugs in Warfare too many to mention, some of these bugs are Biz's problem and some are created by the mod makers.
HQ you need to unlock click straight away to drive, or it goes back to locked thats a benny bug as it does not happen in vanilla.
Those invincible vehicles and men happen only in warfare, and I have not seen that happen in Domination so I say another benny bug.
The money system has a bug if you have $500 and an item cost $400 it will still say you are missing say $180 thats does not happen in vanilla.
In warfare enemy never seem to show up on screen from only 500m away, I have to walk closer to town, and only then do they all show at say 400m, I then either get killed or have to retreat back to repair truck where i had a Metis that was setup on the hill, that never happened in vanilla.
To get Ai to drive truck and say your Ai is the F2 key you use F2 key 4 and then it will have a choice of what vehicles to choose to enter, like truck at 12 o'clock then once you select that number it should have the next option to get in as driver or anywhere so then press that number.
The Ai vehicles never have been able to keep up with the one you drive so the only thing to do is, slow down and wait.:)