Demco UMS Under-Bed 21K Autoslide Hijacker 8550037Get short bed fifth wheel towing for heavy rigs with the Demco Hijacker UMS Under Bed 21K Autoslide (Part #8550037). Combining the convenience of an automatic 14" slider with the cleaner bed advantage of under bed mounting and serious 21,000 lb capacity, this hitch is built for big fifth wheels and toy haulers with universal frame bracket compatibility for a wide range of trucks. The Best of Both Worlds Auto Slider + Clean Bed This hitch combines two