MORryde 0226.8008 RPB72-1621SHD-06 Pin Box System, 18K+ GVWR-Lippert 1621 / HD/SHD Greatly reduced back-and-forth chucking and jerking Cushioned sensation over uneven road conditions Jerk-free starts and stops Smoother, more comfortable in-cab ride Check MORryde Pin Box Fit Chart to ensure correct fit