{"product_id":"tie-down-engineering-81210-bolster-brackets-8-in-galvanized-steel-with-swivel-pair-boat-trailer-bunk-board-replacement","title":"Tie Down Engineering 81210 Wobble Roller Bunk Assembly with 36 Inch Galvanized Steel Cross Bar","description":"\u003cp\u003eThe Tie Down Engineering 81210 Wobble Roller Bunk Assembly is a full pivoting roller support system designed to replace bunk boards on a boat trailer. Because the assembly pivots, it can adjust to support a range of hull shapes and sizes rather than holding a fixed contact profile, which helps the hull settle evenly onto the trailer during loading and retrieval. The assembly is built around a 36 inch galvanized steel cross bar and comes with 2 wobble roller arms, which can be expanded to 4 arms for additional support as needed. It includes 4 rollers finished in black and all mounting hardware required for installation, so no separate hardware purchase is needed to get it onto the trailer frame. The galvanized steel construction resists corrosion in the wet, salt-exposed conditions typical of boat trailer use, while the alloy steel frame provides the strength needed to bear hull weight during launch and haul-out. This assembly is compatible with Tie Down's add-on Wobble Roller Assembly for buyers who want to expand roller coverage beyond the included 2-arm configuration.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Tie Down Engineering\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 81210\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Wobble Roller Bunk Assembly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCross Bar Length:\u003c\/strong\u003e 36 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoller Arms Included:\u003c\/strong\u003e 2 (expandable to 4)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRollers Included:\u003c\/strong\u003e 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Hardware:\u003c\/strong\u003e Included\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Alloy Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Galvanized\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 2.6 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eUniversal boat trailer bunk application; supports a range of hull shapes and sizes.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cp\u003eNo manufacturer cross-reference numbers apply to this part.\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is included with the Tie Down Engineering 81210?\u003c\/strong\u003e The 81210 Wobble Roller Bunk Assembly includes a 36 inch galvanized steel cross bar, 2 wobble roller arms, 4 rollers, and all mounting hardware needed for installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 81210 assembly be expanded with more rollers?\u003c\/strong\u003e Yes, the 2 wobble roller arms included with part number 81210 can be expanded to 4 arms for additional hull support, and the assembly is compatible with Tie Down's add-on Wobble Roller Assembly for further expansion.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does the wobble roller assembly replace on a trailer?\u003c\/strong\u003e This assembly is designed to replace bunk boards on a boat trailer, swapping fixed board contact for a pivoting roller system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow long is the cross bar on part number 81210?\u003c\/strong\u003e The cross bar measures 36 inches and is made of galvanized steel.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material are the rollers and frame made from?\u003c\/strong\u003e The frame is alloy steel with a galvanized finish for corrosion resistance, and the rollers are black.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 81210 fit different hull shapes?\u003c\/strong\u003e Full pivoting action lets the Wobble Roller Bunk Assembly support a range of hull shapes and sizes rather than a single fixed profile.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs mounting hardware included with this assembly?\u003c\/strong\u003e Yes, all mounting hardware is included with the Tie Down Engineering 81210, so no separate hardware purchase is needed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 81210 assembly weigh?\u003c\/strong\u003e The Tie Down Engineering 81210 Wobble Roller Bunk Assembly weighs 2.6 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this the genuine Tie Down Engineering part or an aftermarket copy?\u003c\/strong\u003e Part number 81210 is a genuine Tie Down Engineering Wobble Roller Bunk Assembly, not an aftermarket equivalent.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I add more rollers to the 81210 later?\u003c\/strong\u003e Yes, Tie Down's Wobble Roller Assembly add-on is compatible with the 81210 and adds 2 more rollers and a pivoting arm, though its mounting hardware is sold separately.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color are the rollers on part number 81210?\u003c\/strong\u003e The rollers on the 81210 Wobble Roller Bunk Assembly are black.\u003c\/p\u003e","brand":"Tie Down Engineering","offers":[{"title":"Default Title","offer_id":48991692259547,"sku":"T-D-81210","price":16.3,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/51KcDSpfwrL.jpg?v=1784509960","url":"https:\/\/www.goodvibesmarina.com\/products\/tie-down-engineering-81210-bolster-brackets-8-in-galvanized-steel-with-swivel-pair-boat-trailer-bunk-board-replacement","provider":"Good Vibes Marina","version":"1.0","type":"link"}