The final Camping World Truck Series practice at Iowa Speedway was led by rookie Christopher Bell.
Bell put up a speed of 135.292 mph in the session as he recorded 35 laps around the short track.
John Hunter Nemechek had the best 10-lap average at 131.415 mph.
The first session was led by Ben Rhodes. The ThorSport Racing rookie was 19th fastest in the second session.