 The races were run on dirt and paved ovals mostly in the Eastern United States.The trucks used in the beginning were actually working trucks with tandem rear axles, using street tires, and yet speeds of 150 mph (241 km/h) were still attained on the front straight at Pocono Raceway, and the closed course record of 132 mph (212 km/h) was set in qualifying at Texas World Speedway by Charlie Baker on March 21, 1982.After 1986 when the series was bought by Glenn Donnelly of DIRT (Drivers Independent Race Tracks) the GATR trucks became highly modified with the bodies being cut and lowered, losing the tag axle and shedding more than 2,000 pounds in weight.