So later in R3 you encounter 'Wardens' driving these vehicles and attacking you. This was an early 'mad max' style pass that could show a massive amount of attachments and various add-ons the jeeps could have. The idea was that while riding on a train these trucks would drive up beside a train car, and the side of the back portion would open allowing Wardens to jump on board.
Check out the game!!
my blog: [link]
Coulda used a few of these in Winnipeg the last few weeks... with a better insulated cab of course.
Great design work there.