Tie Down Engineering 81210 Wobble Roller Bunk Assembly with 36 Inch Galvanized Steel Cross Bar

The 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.

Specifications

• Brand: Tie Down Engineering
• Manufacturer Part Number: 81210
• Product Type: Wobble Roller Bunk Assembly
• Cross Bar Length: 36 inches
• Roller Arms Included: 2 (expandable to 4)
• Rollers Included: 4
• Mounting Hardware: Included
• Material: Alloy Steel
• Finish: Galvanized
• Color: Black
• Weight: 2.6 pounds

Fitment

Universal boat trailer bunk application; supports a range of hull shapes and sizes.

Replaces (OEM)

No manufacturer cross-reference numbers apply to this part.

Frequently Asked Questions

What is included with the Tie Down Engineering 81210? 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.

Can the 81210 assembly be expanded with more rollers? 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.

What does the wobble roller assembly replace on a trailer? This assembly is designed to replace bunk boards on a boat trailer, swapping fixed board contact for a pivoting roller system.

How long is the cross bar on part number 81210? The cross bar measures 36 inches and is made of galvanized steel.

What material are the rollers and frame made from? The frame is alloy steel with a galvanized finish for corrosion resistance, and the rollers are black.

Does the 81210 fit different hull shapes? Full pivoting action lets the Wobble Roller Bunk Assembly support a range of hull shapes and sizes rather than a single fixed profile.

Is mounting hardware included with this assembly? Yes, all mounting hardware is included with the Tie Down Engineering 81210, so no separate hardware purchase is needed.

How much does the 81210 assembly weigh? The Tie Down Engineering 81210 Wobble Roller Bunk Assembly weighs 2.6 pounds.

Is this the genuine Tie Down Engineering part or an aftermarket copy? Part number 81210 is a genuine Tie Down Engineering Wobble Roller Bunk Assembly, not an aftermarket equivalent.

Can I add more rollers to the 81210 later? 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.

What color are the rollers on part number 81210? The rollers on the 81210 Wobble Roller Bunk Assembly are black.