GEN-Y EXECUTIVE TORSION-FLEX Rhino Fifth Wheel King Pin Box 3.5K - 6.5K pin weight range 30K Towing Model GH-8071GEN Y EXECUTIVE TORSION FLEX Rhino Fifth Wheel King Pin Box 3. 5K 6. 5K pin weight range 30K Towing Model GH 8071 Attention RV enthusiast! The EXECUTIVE is the best riding fifth wheel pin box on the market. By isolating the truck from the fifth wheel trailer with TORSION FLEX Technology, the shock transfer is eliminated by up to 90%. This not only results in an incredibly smooth ride for truck and RV, it also gives the driver much more steering