The usual wear and tear items such as brake pads and alternator. Please keep in mind that the vehicle was used as a police unit. The vehicle was always running with the air conditioner running.
We had 5 Rangers in our department. Very fast acceleration with the v6 and durability. We used the Rangers as police units. The Ranger takes curbs, rocks, rear end collisions and cornering without any problems. We managed to rack up 100,000 miles on each of the Rangers. The only problems we experienced was the usual wear and tear items; brakes and alternators.
We drove the hell out of these things and abused them bad. Very determined trucks. Just make sure to get the v6.
Do not... Do not... get the 4 cylinder! It gets the same gas mileage and is not capable of heavy duty usage.
I have never seen a police truck before. do you use the trucks as patrol cars??