CURT Replacement Legs for A20 5th Wheel Hitch Head Model 16906CURT Replacement Legs for A20 5th Wheel Hitch Head Model 16906 The CURT A20 5th wheel hitch offers smoother, quieter towing for your home away from home, combining the patented technology of our A series, an easier mounting system and the power of a 20K 5th wheel hitch. These replacement 5th wheel legs are designed to accept the CURT A20 hitch head. They feature unique alignment pegs and easy access mounting bolts for simple leg to body attachment.