State Troopers in pickup trucks?

I was heading north on 81 at a little before 7 pm and saw a pickup truck with police lights in what appeared to be a traffic stop with another vehicle right before the Avoca/Airport exit.

This truck didn't appear to have any markings or indicators on it to show it was an official law enforcement vehicle, save for a bull bar on the front bumper.

I know other municipalities have unmarked cars and I know other states use them on highways to catch speeders, but I didn't think that was a thing there.

Just wanted to spread the word. The troopers have a big enough budget and don't need to fund themselves further with more superfluous speeding tickets.