It seems that Rob Astorino drives a Chevy 1500 while Andy Giulani drives a Dodge Ram 2500 Cummins turbo-diesel. It looks like Mr. Giulani’s pickup has a lift-kit and Fuel Off-Road wheels with 35s, but I could not determine the lift-kit from those pictures.

Mr. Giulani probably has commercial plates while Rob Astorino has passenger plates due to weight of the vehicle, although he could also have commercial plates. The big advantage to passenger plates is they can be driven on the parkway. Plus, gasoline is a lot cheaper currently in New York State then diesel.