{"product_id":"21k-underbox-double-pivot-fifth-wheel-hitch-for-reese-ums-brackets-8550033","title":"21K Underbox Double Pivot Fifth Wheel Hitch For Reese UMS Brackets #8550033","description":"\u003cp\u003eTow your fifth wheel with confidence using the \u003cstrong\u003eDemco Hijacker SL Series 21K Underbox Double Pivot Fifth Wheel Hitch (Part #8550033)\u003c\/strong\u003e. Engineered for long-box trucks with the Reese UMS bracket system, this fixed-mount fifth wheel hitch combines a sturdy 21,000 lb capacity with thoughtful design touches that deliver a smoother, safer ride — backed by Demco's reputation for quality and built right here in the USA. \u003cem\u003e(Have a short-bed truck instead? See the Autoslide options: \u003ca href=\"https:\/\/thervsurplus.com\/products\/demco-21k-5th-wheel-hitch-without-rails-above-bed-mount-8550035\"\u003e21K above-bed (8550035)\u003c\/a\u003e, \u003ca href=\"https:\/\/thervsurplus.com\/products\/demco-21k-5th-wheel-hitch-with-rails-above-bed-mount-8550036\"\u003e21K above-bed WITH rails (8550036)\u003c\/a\u003e, \u003ca href=\"https:\/\/thervsurplus.com\/products\/demco-ums-under-bed-21k-autoslide-hijacker-8550037\"\u003e21K UMS Under-Bed (8550037)\u003c\/a\u003e, \u003ca href=\"https:\/\/thervsurplus.com\/products\/demco-ums-under-bed-21k-ford-prep-package-autoslide-hijacker-8550038\"\u003e21K Ford Prep Package (8550038)\u003c\/a\u003e, \u003ca href=\"https:\/\/thervsurplus.com\/products\/demco-autoslide-5th-wheel-trailer-hitch-w-slider-single-jaw-above-bed-18-000-lbs-8550034\"\u003e18K above-bed (8550034)\u003c\/a\u003e, or \u003ca href=\"https:\/\/thervsurplus.com\/products\/demco-ums-under-bed-18k-autoslide-hijacker\"\u003e18K UMS Under-Bed (8550022)\u003c\/a\u003e.)\u003c\/em\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e21,000 lb gross trailer weight\u003c\/strong\u003e rating\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e5,250 lb gross pin weight\u003c\/strong\u003e rating\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThat puts it in the right capacity range for most heavy fifth wheel applications — from large travel-style fifth wheels to toy haulers and full-size rigs.\u003c\/p\u003e\n\n\u003ch3\u003eUnderbox (UMS) Mounting — A Cleaner Truck Bed\u003c\/h3\u003e\n\u003cp\u003eThe standout feature of this hitch is its \u003cstrong\u003eunique under-bed mounting system (UMS)\u003c\/strong\u003e — it uses the Reese UMS brackets installed under your truck bed rather than rails sitting on top. The result: when the hitch is removed, \u003cstrong\u003eyour truck box is completely free of bed rails\u003c\/strong\u003e, leaving you with full bed usability for hauling other loads. No more working around rails when your bed isn't being used for towing.\u003c\/p\u003e\n\n\u003ch3\u003eWrap-Around Jaw + Double Pivot Head = Smoother Ride\u003c\/h3\u003e\n\u003cp\u003eTwo design features set this hitch apart in terms of ride quality:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWrap-around jaw with locking bar\u003c\/strong\u003e for a smoother, safer, more secure connection to your kingpin\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDouble-pivot head with polyurethane bumpers\u003c\/strong\u003e eliminates side-to-side movement when uncoupled and cushions the pivot action when coupled — meaning less jarring through the truck cab when towing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAdjustable Vertical Height\u003c\/h3\u003e\n\u003cp\u003eThe hitch offers \u003cstrong\u003e16\" to 19\" of vertical height adjustment\u003c\/strong\u003e, giving you the range to dial in a level connection between your truck and fifth wheel regardless of how the two sit together. A 4-way pivot accommodates the natural movement of towing over uneven terrain.\u003c\/p\u003e\n\n\u003ch3\u003eLong-Box Application\u003c\/h3\u003e\n\u003cp\u003eThe 8550033 is built specifically for \u003cstrong\u003elong-box truck applications\u003c\/strong\u003e. If your truck has a short box, you'll want a slider hitch instead to avoid kingpin-to-cab collisions during tight turns.\u003c\/p\u003e\n\n\u003ch3\u003eQuick, Clean Installation\u003c\/h3\u003e\n\u003cp\u003eInstallation is straightforward — \u003cstrong\u003eno drilling, no cutting required\u003c\/strong\u003e. Bed hole plugs are included for a clean appearance when the hitch is removed. Estimated install time is approximately \u003cstrong\u003e2 hours\u003c\/strong\u003e. (Please note: mounting hardware is not included — confirm you have or need the appropriate Reese UMS brackets for your truck before ordering.)\u003c\/p\u003e\n\n\u003ch3\u003eBuilt to Last\u003c\/h3\u003e\n\u003cp\u003eThe hitch features a \u003cstrong\u003eblack powder-coated finish\u003c\/strong\u003e for long-lasting corrosion resistance and a clean look. \u003cstrong\u003eMade in the USA\u003c\/strong\u003e and backed by a limited 5-year warranty.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e21,000 lb gross trailer weight \/ 5,250 lb pin weight\u003c\/strong\u003e rating\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUnder-bed (UMS) mounting\u003c\/strong\u003e — leaves truck box free of rails when hitch is removed\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWrap-around jaw with locking bar\u003c\/strong\u003e for smoother, safer kingpin connection\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDouble-pivot head with polyurethane bumpers\u003c\/strong\u003e for cushioned coupling\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003e4-way pivot\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003e16\"–19\" vertical height adjustment\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eLong-box application\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eNo drilling or cutting required\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eBed hole plugs included\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eBlack powder-coated finish\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e~2-hour estimated install\u003c\/li\u003e\n  \u003cli\u003eBacked by a limited 5-year warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eBrand: Demco\u003c\/li\u003e\n  \u003cli\u003eSeries: Hijacker SL\u003c\/li\u003e\n  \u003cli\u003ePart Number: 8550033\u003c\/li\u003e\n  \u003cli\u003eType: Underbox Double-Pivot Fifth Wheel Hitch\u003c\/li\u003e\n  \u003cli\u003eCapacity: 21,000 lb GTW \/ 5,250 lb pin weight\u003c\/li\u003e\n  \u003cli\u003eMount Type: Fixed\u003c\/li\u003e\n  \u003cli\u003eVertical Height Adjustment: 16\"–19\"\u003c\/li\u003e\n  \u003cli\u003ePivot Type: 4-way (double pivot head)\u003c\/li\u003e\n  \u003cli\u003eMaterial: Steel\u003c\/li\u003e\n  \u003cli\u003eFinish: Black powder coated\u003c\/li\u003e\n  \u003cli\u003eMounting Hardware Included: No (uses Reese UMS brackets)\u003c\/li\u003e\n  \u003cli\u003eDrilling Required: No\u003c\/li\u003e\n  \u003cli\u003eCutting Required: No\u003c\/li\u003e\n  \u003cli\u003eLock Position: Handle\u003c\/li\u003e\n  \u003cli\u003eApplication: Long-box trucks\u003c\/li\u003e\n  \u003cli\u003eEstimated Install Time: ~2 hours\u003c\/li\u003e\n  \u003cli\u003eCountry of Origin: USA\u003c\/li\u003e\n  \u003cli\u003eWarranty: Limited 5-year\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Demco","offers":[{"title":"Default Title","offer_id":54723681157423,"sku":null,"price":1199.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/7663\/0063\/files\/DMC8550033.jpg?v=1772809963","url":"https:\/\/thervsurplus.com\/products\/21k-underbox-double-pivot-fifth-wheel-hitch-for-reese-ums-brackets-8550033","provider":"The RV Surplus","version":"1.0","type":"link"}