So what are the vehicles for? A few possibilties come to mind. Since black SUVs tend to be Hollywood short hand for government, these could be off road version, possibly part of Harold Attinger's (Kelsey Grammer) crew. When not goverment, black vehicles just means bad guys so Decepticon alt modes? Or they simply serve the practical purpose of being rigged for the camera crew to film action scenes. I guess NEST is another possibility but I don't think they have a part in this movie. However I have no info to back that idea up. As always time will tell.
Update: Two things: 1) corrected the location typos (no clue how managed to screw up both of them) and 2) from the comments it appears on the vehicles is nearly identical to one used in Revenge of the Fallen and the other has been ID as a Rally Fighter.