Rollers let a boat roll on and off with minimal effort, which suits steep ramps, shallow-water launching and heavier hulls. Skids and bunks spread the load across a broad, gentle bearing surface, which suits fibreglass hulls and deep, well-covered ramps where the boat floats on and off. Most well-set-up trailers actually combine both: keel rollers down the spine for guidance and support, with skids or bunks on the bilges to cradle the hull. The right mix comes down to hull material, boat weight and how steep your usual boat ramp is.
What is the difference between rollers, skids and bunks?
They are three ways of supporting a hull on a trailer, and they behave very differently at the ramp:
- Rollers are moulded wheels that spin on a spindle, letting the hull move over them. They come in keel, wobble, bilge, bow, self-centring, concave and V-block styles to support different parts of the hull.
- Skids are low-friction strips or blocks the hull slides across. Bolt-on guide kits, trailer strip and support blocks give a continuous or segmented bearing surface.
- Bunks are longer carpeted or skid-faced timber or composite runners that cradle the hull along the bilges. They are essentially an extended skid support and share the same launch-and-retrieve behaviour.
Because skids and bunks work on the same principle (the hull slides rather than rolls), they are usually specced together from the same skids and guides range, while rollers are chosen from the boat trailer rollers range.
What are the pros and cons of each?
| Support type | Pros | Cons | Best for |
|---|---|---|---|
| Rollers | Boat rolls on/off with little effort; great for solo launching; works on shallow ramps where the boat is not fully floating; easy retrieve for heavier hulls | Point-load contact can mark soft gel-coat if the wrong material is used; more moving parts to inspect and replace; needs correct alignment | Aluminium/alloy boats, steep or shallow ramps, heavier or frequently launched rigs |
| Skids | Broad, low-friction bearing surface; gentle on hulls; fewer moving parts; simple to maintain | Needs the boat to be floating or near-floating to launch; harder work on shallow ramps; strip can wear over time | Fibreglass hulls, deep ramps, lighter trailerable boats |
| Bunks | Longest, most even hull support; excellent for large or heavy fibreglass hulls; very hull-friendly | Requires deeper water to launch and retrieve; more drag on retrieve; bulkier setup | Larger fibreglass and glass-over-timber hulls on deep ramps |
Which suits which boat and boat ramp?
Start with the two questions that matter most: what is the hull made of, and how deep does the water get where you launch?
- Aluminium tinnies and plate boats on steep or shallow ramps: rollers win. The hull is tough, the low-friction contact lets you launch without backing right in, and retrieve is a simple winch-and-roll.
- Fibreglass hulls on deep, sealed ramps: skids or bunks are kinder to gel-coat and give even support along the hull.
- Mixed conditions or a boat that gets launched anywhere: a combination setup gives you the best of both, which we cover below.
Ramp gradient is the deciding factor as often as the hull. A steep or shallow ramp favours rollers because you rarely get the boat floating; a long, deep ramp lets a skid or bunk boat slide clear easily.
Which roller material suits my hull?
If you go with rollers, the material matters as much as the shape. There are three to choose from:
| Material | Character | Ideal for |
|---|---|---|
| Hard blue nylon | Tough, low-friction and hard-wearing under heavy loads and frequent launching | Aluminium and alloy hulls |
| Soft red poly (polyurethane) | Marking-resistant and gentle on finishes | Fibreglass, gel-coat and painted hulls |
| Black rubber | Economical, general-purpose all-rounder | Mixed or budget-conscious builds |
The pattern is simple: match hard blue nylon to aluminium and alloy hulls and soft red poly to fibreglass and gel-coat hulls, with black rubber as the versatile middle ground. For the fuller material and size breakdown, see our boat trailer roller selection guide.
When should you combine rollers with skids or bunks?
Combining is the norm rather than the exception on well-built trailers, and it is where a lot of DIY rigs get an easy upgrade. The common approaches are:
- Keel rollers plus bunks: a line of keel rollers down the centre carries and guides the hull along the spine, while bunks on the bilges cradle the sides. This gives you easy centring on retrieve with broad, gentle support at rest.
- Wobble rollers plus keel support: wobble rollers flex to follow the hull shape on the bilges while keel rollers or V-blocks support the keel line, useful for hulls with more deadrise.
- Skids with self-centring or bow rollers: mostly skid-supported trailers still benefit from a self-centring or bow roller at the front to line the boat up as it comes on.
A good rule of thumb: use rollers where you need the boat to move and centre itself, and use skids or bunks where you need it to sit still and spread its weight. Matching the two lets you tune a trailer to a specific hull and a specific ramp.
How do I spec a roller or skid setup for a customer's trailer?
For trailer builders, marine dealers and workshops, the build usually comes together from a few groups of parts: the rollers or skids themselves, the brackets, mounts, yokes and spindles that hold them, and the running gear underneath. Confirm hull material, approximate weight, the roller bore and the size the frame is drilled for, and the customer's typical ramp before you finalise. As an Australian-owned trade supplier and distributor shipping Australia-wide from Brisbane, Viking Rollers can put together the rollers, skids and mounting hardware for a full trailer package on a wholesale quote.
Get a trade quote from Viking Rollers
Tell us the hull material, boat weight and ramp conditions and we will help you spec the right mix of rollers, skids and bunks, plus the brackets and running gear to suit. Request a quote or call our Brisbane team on 07 3274 6967 for trade and wholesale pricing, dispatched Australia-wide.