3336 Dunbier Single Supa-Rolla Assembly | Marine Trailer Part

🔧 Product Description

Dunbier Single Supa-Rolla Assembly with 40mm Square Leg - Part Number: 3336

A fully adjustable Dunbier single hull-support assembly using steel roller arms. It is designed to conform to the hull as the boat is loaded and to distribute support over multiple wobble-roller contact points. This reference is supplied complete with wobble rollers, arms and 40mm square leg.

⚙️ Key Features

• 2 roller positions

• Steel Supa-Rolla construction

• Adjustable hull-support geometry

• Suitable for launch, retrieval and road support

• Replaceable rollers, arms and mounting hardware

• Designed for Dunbier and compatible trailer layouts where dimensions match

📏 Specifications

• Assembly position: single

• Roller count: 2

• Arm material: steel

• Supplied configuration: complete with wobble rollers, arms and 40mm square leg

• Crossmember and frame mounting must be confirmed

🔄 Cross Reference & Related Parts

• Dunbier: 3336

• Steel Supa-Rolla arm assembly: Dunbier 3261

• Grey steel-trailer wobble roller: Dunbier 2969

• Large yellow alloy-trailer wobble roller: Dunbier 2968

• Related assemblies: Dunbier 3330-3342

🚤 Trailer Compatibility & Application

• Suitable for Dunbier Supa-Rolla, alloy and compatible roller trailers using the matching assembly position

• Roller-arm spacing and hull contact must be adjusted to the individual boat

• Do not mix large-alloy roller arms and steel-system components without dimensional confirmation

🔌 Function

Supports, guides and centres the hull while allowing individual rollers to pivot and share the load.

Common signs of wear or failure:

• Rollers are seized, cracked or worn flat

• Arms are bent or corroded

• Bubble plates or pivots have excessive play

• U-bolts loosen or elongate mounting holes

• Hull load is concentrated on one or two rollers

🛠️ Installation & Safety

• Support the boat before replacing a loaded assembly

• Mount to the correct crossmember section with rated U-bolts

• Set all arms so the hull is supported evenly

• Confirm rollers rotate freely and do not contact strakes incorrectly

• Recheck alignment after loading the boat

📦 Condition

• Genuine Dunbier Marine Products part

• Brand new

• Supplied as one single supa-rolla assembly with 40mm square leg

• Supplied in original or equivalent packaging