Get your engines revving this weekend at the North Iowa Nationals Competitors from across the country are converging on Rockwell for the annual tractor and truck pulling event Posted: Jul 10, 2021 2:28 AM Updated: Jul 10, 2021 6:34 AM Posted By: Alex Jirgens ROCKWELL, Iowa - Tractor and truck pulling enthusiasts have a reason to rejoice - the North Iowa Nationals are back! About 140 pullers from across the country brought their tractors, trucks and modified versions of both to compete to see how far they can pull a metal sled to gain points as part of the series of competitions sanctioned by the National Tractor Pullers Association.