When Doepker introduced the Impact gravel end dump in 2009 the market had not seen anything like it, and the design still leads its class on strength, weight and stability. A highly engineered Hardox 500Tuf tapered tub is integrated into a wider-than-industry-standard frame, delivering superior cleanout, maximum payload stability and the highest resale value in its class. The signature Quick Adjust box system moves the tub forward or back on the frame — shift back for asphalt paving, shift forward to optimize wheelbase weight distribution when stockpiling aggregate or hauling contaminated soil.