Part rock crawler, part dune buggy, part stadium truck. That pretty much sums up the vehicles John Grounds campaigns in Ultra4 Racing, including the grueling and highly popular King of the Hammers event. These unique rigs, along with the events they’re built for, require special driving and wrenching skills. And as you can imagine (if you don’t already know), they are incredibly fun to see in action! As the owner of Proving Grounds Racing, John proved himself by methodically working his way up into Ultra4 Racing’s 4500 Modified and 4400 Unlimited classes. But you don’t have to have vehicles like the ones shown here to get your start in this fun and challenging sport. John joined us to talk about his season (the first in which he’s campaigned multiple vehicles) and provide some tips for getting started in the sport.
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Author: David Fuller

David Fuller is OnAllCylinders' managing editor. During his 20-year career in the auto industry, he has covered a variety of races, shows, and industry events and has authored articles for multiple magazines. He has also partnered with mainstream and trade publications on a wide range of editorial projects. In 2012, he helped establish OnAllCylinders, where he enjoys covering all facets of hot rodding and racing.