CURT A20 5th Wheel Slider Hitch with Base Rails for Short Bed Trucks, 20,000 lbs Model 16631CURT A20 5th Wheel Slider Hitch with Base Rails for Short Bed Trucks, 20,000 lbs Model 16631 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. Like our A16 hitch, this 20K 5th wheel hitch uses a patented cast yoke to allow for unimpeded head movement, while providing exceptional stability for the