The 31st annual Shell Rotella SuperRigs competition is taking place this week in Tomah, WI, at the Monroe County Fairgrounds as part of the Budweiser Dairyland Super National Truck & Tractor Pull event. Truckers from across the U.S. and Canada are vying for cash and prizes valued at approximately $25,000 for this year’s SuperRigs contest, with 12 drivers and their vehicles ultimately being selected to appear in the 2014 Shell Rotella SuperRigs calendar. All photos supplied by Shell.