Boat Trailer Winch Buying Guide

Manual vs Electric Trailer Winches — Which Is Right for You?

The manual vs electric decision is the first and most significant choice in trailer winch selection. Both types have genuine strengths:

Manual winches use a hand crank to drive the spool and wind the strap or cable. They're mechanically simple, require no electrical connection, are reliable with basic maintenance, and are the standard fitment on the vast majority of Australian trailerable boats. For boats up to approximately 5–6 metres on typical boat ramps with reasonable gradients, a good quality manual winch is entirely adequate and significantly more affordable than electric. Manual winches also work reliably without a battery connection — relevant for trailers that aren't always connected to the tow vehicle's electrics.

Electric winches are powered by a 12V connection (typically from the tow vehicle's trailer socket, a dedicated trailer battery, or the tow vehicle's battery via an extension lead). They retrieve the boat at the press of a button, with no cranking required. The practical advantages are most significant for: solo launching and retrieval where you need to drive the tow vehicle and manage the winch simultaneously; boats over 5–6 metres or 800–1000kg where manual cranking becomes genuinely arduous; steep or long ramps; and regular users who value the time and effort saving for frequent launches.

Browse electric trailer winches and manual trailer winches at Marine Depot.

Load Rating — The Most Important Specification

A trailer winch's load rating (expressed in kilograms) is the maximum load the winch is designed to pull. This rating should be matched to your boat's weight — and "boat weight" in this context means the fully loaded boat: hull, engine, fuel, anchor, safety gear, fishing equipment and any other gear you typically carry. Not just the hull weight on its own.

The practical approach to load rating selection is to look up your boat's approximate loaded weight and then choose a winch rated comfortably above that figure. A winch operating at the limit of its rated capacity on every launch has a shorter service life than one operating well within its rating. As a rule of thumb, choosing a winch rated at least 1.3–1.5 times your boat's loaded weight gives a practical working margin without unnecessarily oversizing.

It's also important to understand that winch capacity ratings assume the boat is on well-maintained rollers, the trailer is in the water at an appropriate depth, and the strap or cable angle is reasonable. Loading a heavy boat on partially seized rollers up a steep ramp increases the effective load on the winch significantly compared to the same boat on a well-maintained rig. Factor in your typical ramp conditions when considering how much headroom above your boat's weight to build into the rating.

Strap vs Wire Cable — Pros and Cons of Each

Trailer winches use either a flat nylon webbing strap or a steel wire cable to connect the winch drum to the boat's bow eye:

Nylon webbing strap is the dominant choice on modern recreational trailer winches in Australia. Webbing is lighter than wire, handles without risk of snagging on skin the way wire does, doesn't kink or take a set under load, and is softer on the bow eye and fitting it connects to. Webbing straps do wear — UV degrades nylon over time, abrasion from running over rough edges wears the surface, and wet-dry cycling stiffens the material. Inspect the strap at each use for fraying, cuts and UV fading. Replace when any wear is evident — a strap failure at the ramp is at minimum very inconvenient.

Wire cable is more common on older trailers and heavier-duty commercial applications. Wire cable has a higher rated load for its diameter than equivalent webbing and is more durable under heavy use. The downsides are significant in recreational use: wire kinks and takes a permanent set if it loops back on itself, which weakens it; frayed wire is very hazardous to hands; wire is heavier; and it's harder on the bow eye fitting. Inspect wire regularly for kinks, fraying (protruding wire ends), rust and flattening.

Single-Speed vs 2-Speed Manual Winches

Manual trailer winches come in single-speed and two-speed (2-speed) versions:

Single-speed winches have one gear ratio — you crank the handle and the drum turns at a fixed rate. Simpler and less expensive than 2-speed. The limitation is that the same gear ratio that makes the light early stages of loading easy provides less mechanical advantage for the heavy final haul onto the bow stop.

2-speed winches have two gear ratios: a high-speed setting for pulling the boat along the rollers quickly in the early stages of loading, and a low-speed (high-torque) setting for the heavy haul at the end. Switching between the two is typically done by reversing the crank direction or by a lever. The low gear provides significantly more mechanical advantage for the final load — meaningful on heavier boats or steep ramps. If you find yourself struggling with the last 300–500mm of loading on a single-speed winch, a 2-speed will noticeably reduce the effort required.

Winch Drum and Strap/Cable Capacity

The winch drum needs to hold enough strap or cable to allow the boat to be fully deployed on the ramp. If the boat is reversed down a long ramp, more strap needs to unspool than on a short ramp. Most standard winches hold 5–8 metres of strap — adequate for most recreational ramps. On very long or steep ramps where more strap length is needed, check the drum capacity specification.

The strap or cable should spool onto the drum in neat, even layers rather than crossing over or jamming on one side. Uneven spooling creates problems — the effective load rating of the winch is based on correct layered spooling. If strap is crossing and jamming, check the strap guide or fairlead is correctly positioned.

The Winch Is for Loading — Not for Road Transport Tie-Down

This point is worth emphasising explicitly because it causes accidents: the trailer winch is designed to pull the boat onto the trailer. It is not a tie-down system for road transport. The bow connection via the winch strap holds the boat to the bow stop — it prevents the boat from sliding forward — but it does not secure the boat from lifting, tilting or sliding sideways during road travel.

Boats being towed on public roads should be independently secured with rated ratchet tie-down straps at the transom and trailer frame — requirements can vary by state and vehicle setup, so check with your relevant road authority. The winch holds the bow; the tie-down straps hold everything else. Browse ratchet and transom tie-downs at Marine Depot for the straps needed to properly secure the boat for road travel.

Mounting — Ensuring Compatibility with Your Trailer

Trailer winches mount to the trailer's A-frame post or winch stand via a bolt-plate fixing. Before purchasing, check:

• Mounting hole pattern — the spacing between the mounting bolts on the winch base needs to match the holes on your trailer's winch stand. Most Australian trailers use a common pattern, but variations exist. If replacing an existing winch, the new winch's bolt pattern should ideally match the old one to avoid re-drilling.
• Winch stand height — the winch should mount at a height that puts the strap or cable in reasonable alignment with the boat's bow eye when it's on the trailer. A significant upward or downward angle from the winch to the bow eye creates side loading on both the winch drum and the bow eye fitting. Some adjustment is typically possible by choosing between mounting hole positions on the winch stand.
• Winch stand load rating — if you're upgrading to a significantly heavier-rated winch (for a larger boat), ensure the winch stand itself is rated for the new winch's capacity. An underrated or deteriorated winch stand can fail under load even if the winch is correctly rated.

Electric Winch Installation Requirements

Installing an electric trailer winch requires a 12V power connection. Common options include:

• A 7-pin trailer plug on the tow vehicle with an auxiliary circuit for the winch (requires the tow vehicle to have an available auxiliary circuit)
• A dedicated sealed battery mounted on the trailer, charged via the trailer socket when connected to the vehicle
• A heavy-duty extension lead from the tow vehicle's battery to the winch for ramp use only

Electric winches draw significant current under load — typically 20–50 amps or more depending on the winch and the load. Wiring needs to be appropriately rated and fused for this current. Follow the winch manufacturer's wiring instructions carefully. If in doubt, have a qualified auto electrician or marine electrician complete the installation.

Maintenance — Keeping Your Winch Reliable

A well-maintained trailer winch should provide many years of reliable service. Key maintenance steps:

• Rinse the winch with fresh water after every saltwater launch and retrieval — salt accumulation in the ratchet mechanism and pivot points accelerates corrosion and seizure
• Lubricate the ratchet pawl, pivot pins and handle pivot regularly with a water-displacing lubricant or light marine grease
• Inspect the strap or cable before each use — check for fraying, cuts, UV fading (strap) or kinking and rust (wire)
• Check the bow hook or snap hook at the strap end — this is the highest-stress point in the system and is subject to corrosion and wear at the pivot
• For electric winches, check the wiring connections for corrosion, the contactor or relay for function, and the remote control or switch for water ingress

Shop Trailer Winches at Marine Depot

• Trailer Winches — full range
• Electric Trailer Winches
• Manual Trailer Winches
• Trailer Rollers
• Ratchet & Transom Tie-Downs

Related guides: Boat Trailer Guides | Boat Trailer Roller Guide