Note to self....vehicle roof is only level II (or less). Get some elevation, say 4 stories high and shoot down with your .308 or higher and you’ll probably bag a bad guy.
Lenco didn’t armor the rear diff on the E-350 and it’s the lowest point on the rear of the van. Hit the ground and pour fire into the thin stamped tin differential cover - mobility kill.
One other thing - those conversions have no forward gun ports, no roof hatch and the engine bay isn’t actually armored. Get in front of it and start firing into the radiator, engine, etc., etc.
I don’t remember if those had firewall armor to protect the occupants. If didn’t, all the more reason to pour fire into the front.