CURT Replacement Round Weight Distribution Hitch Spring Bar, 8K Model 17072CURT Replacement Round Weight Distribution Hitch Spring Bar, 8K Model 17072 Your route is planned and the trails are calling, but before you can cover any ground, you need to start with a solid connection between your tow vehicle and trailer. The CURT round bar weight distribution hitch with integrated lubrication offers a smooth ride and level towing with its heavy duty components and built in lubrication system. From travel trailers to popup