Tie Down Engineering Wobble Roller Bunk Assembly 86550, 36 in. Galvanized Steel Cross Bar, Boat Trailer Roller Kit

The Tie Down Engineering Wobble Roller Bunk Assembly (Part 86550) replaces fixed trailer bunks with a roller system that cradles the hull and lets it roll smoothly onto and off the trailer, reducing hull scuffing and easing launch and retrieval, especially in shallow water or at low-clearance ramps. The assembly is built around a 36 in. Galvanized steel cross bar that mounts across the trailer frame and carries 2 wobble roller arms, each fitted with a wobble roller. Because the wobble rollers pivot and self-align to the hull's shape, they maintain even contact across curved sections of the hull instead of the single contact line typical of straight rollers, spreading the load and reducing wear points.

The cross bar and arm layout is expandable to 4 arms for boats that need additional roller support along the bunk, and the assembly ships with all mounting hardware required to install the included components onto a compatible trailer frame. The galvanized steel construction resists corrosion in the wet, salt-exposed environment typical of boat trailers. This assembly is compatible with Tie Down's Wobble Roller add-on components, allowing the roller support to be extended as needed.

Specifications

• Brand: Tie Down Engineering
• Manufacturer Part Number: 86550
• Product Name: Wobble Roller Bunk Assembly
• Cross Bar Length: 36 inches
• Cross Bar Material: Galvanized steel
• Included Roller Arms: 2 wobble roller arms (expandable to 4 arms)
• Included Rollers: 4 rollers
• Mounting Hardware: Included
• Weight: 28 pounds
• UPC: 081628865509
• Category: Boat Trailer Rollers

Fitment

Universal boat trailer bunk application; expandable from 2 to 4 wobble roller arms to suit the hull being supported. Compatible with Tie Down's Wobble Roller Front Assembly (Part 86574) for added front cross member support and the Wobble Roller Assembly add-on (Part 86551) for extending roller coverage.

Replaces (OEM)

No OEM cross-reference numbers are specified for this part.

Frequently Asked Questions

What is included with the Tie Down Engineering Wobble Roller Bunk Assembly (Part 86550)? Part 86550 includes a 36 in. Galvanized steel cross bar, 2 wobble roller arms, 4 rollers, and all mounting hardware needed to install those components.

Can the Wobble Roller Bunk Assembly be expanded to more rollers? Yes, the 86550 assembly ships with 2 wobble roller arms but the cross bar layout is expandable to 4 arms for boats needing additional roller support.

What material is the cross bar made of? The 36 in. Cross bar on the 86550 Wobble Roller Bunk Assembly is made of galvanized steel for corrosion resistance in wet trailering conditions.

How long is the cross bar on this assembly? The cross bar included with the Tie Down Wobble Roller Bunk Assembly 86550 measures 36 inches.

Is this assembly compatible with other Tie Down wobble roller parts? Yes, Part 86550 is compatible with Tie Down's Wobble Roller Assembly add-on (Part 86551) and the Wobble Roller Front Assembly (Part 86574), which are sold separately.

What is the difference between Part 86550 and Part 86551? Part 86550 is the full Wobble Roller Bunk Assembly with the cross bar, 2 roller arms, 4 rollers, and mounting hardware, while Part 86551 is an add-on with 2 additional wobble rollers and a pivoting roller arm and does not include mounting hardware.

Does the Wobble Roller Bunk Assembly include mounting hardware? Yes, all mounting hardware needed to install the 86550 assembly's cross bar, roller arms, and rollers is included.

How much does the Wobble Roller Bunk Assembly weigh? The Tie Down Engineering Wobble Roller Bunk Assembly, Part 86550, weighs 28 pounds.

What does a wobble roller do compared to a fixed bunk? A wobble roller pivots and self-aligns to the hull's curve, maintaining even contact as the boat rolls onto or off the trailer, which the fixed bunks this assembly replaces cannot do.

Is the 86550 assembly designed for a specific trailer frame size? The 36 in. Galvanized cross bar mounts across the trailer frame; frame-specific bracket fitment is covered separately by the Wobble Roller Front Assembly, Part 86574, for 3x3 or 3x4 frames.