SB216XLHD special Heavy Duty 16 inch extended coupler for a flatbed truck with a 4-1/2 inch sqaure trailer stem.
All extended gooseneck trailer couplers are fitted with premium “self-latching gooseneck trailer couplers” for the standard 2-5/16 gooseneck ball. These couplers latch when the trailer is lowered onto the ball. To uncouple, you simply pull a release cable located near the trailer jack handle. The couplers have a molded hitching guide for easy coupling. The couplers are precision cast of Chrome Vanadium Steel with a Stainless steel latching pin and a stainless steel spring. The couplers carry a V19 rating of 28,000 pounds and was tested to 42,000 pounds to gain this rating.