Z to win.

[Oromuth]

If you find yourself in an enemy vehicle and they happen to exit, press Z to switch seats. Enjoy your new vehicle!!!

[Do_Be]

right? unfortunately for me half the time pressing Z does nothing. But when it does work its a nifty trick.

Can also unlock vehicles from passenger side while enemy is scrapping.

If your truck gets shot you can use this to make a quick exit and haul as many mats away as possible while enemy thinks youre in driver seat. (only really works if it's 1-2 guys using a rifle against you)

[Oromuth]

I was unable to unlock the vehicle when I was the driver. Had to wrench the enemy APC I stole. Might of changed. Regardless, I usually Z when I am dropping off Logi BMats, depending on which side I am on.
It might take longer, but it feels cool.