Trailer Winch Buying Guide: Capacity, Two-Speed vs Electric and Straps
Quick answer: Size a trailer winch from your total loaded boat weight (hull, engine, fuel, batteries and gear), not the brochure dry weight. As a starting point, a winch rated for about half to two thirds of that weight works on roller trailers and moderate ramps, so a 3,000 lb rig typically wants a 2,000 to 2,500 lb two-speed winch. Size up for bunk trailers and steep ramps, choose a two-speed above about 2,500 lb of boat, and go electric above roughly 4,000 lb or if you launch solo often. Always check the winch maker's maximum boat weight rating.
The winch does one job: pull the boat up onto the trailer and hold the bow snug against the bow stop. A winch that is too small makes every retrieve a workout, slips under load, and wears out its gears and strap. A winch that is properly matched cranks smoothly even on a steep ramp. This guide walks through capacity, gear ratio, manual versus electric, strap versus cable, and mounting.
Step 1: Calculate your real boat weight
Add up everything the winch has to pull:
- Hull dry weight from the builder
- Engine or engines, including the lower unit
- Fuel at about 6 lb per gallon of gasoline
- Batteries, at roughly 40 to 70 lb each for lead acid
- Anchors, coolers, tackle, water and everything else you leave aboard
Most owners underestimate this by 500 lb or more. When in doubt, weigh the boat on the trailer at a public scale and subtract the trailer weight.
Step 2: Match winch capacity to the load
| Loaded boat weight | Typical winch rating | Recommended type |
|---|---|---|
| Up to 1,500 lb | 600 to 1,200 lb | Single-speed manual |
| 1,500 to 2,500 lb | 1,200 to 1,800 lb | Single or two-speed manual |
| 2,500 to 4,000 lb | 2,000 to 2,500 lb | Two-speed manual |
| 4,000 to 6,000 lb | 3,000 lb or more | Heavy two-speed manual or electric |
| Over 6,000 lb | Electric rated for the boat weight | Electric with manual backup |
The pull rating is a line pull figure, not the boat weight, because rollers and water carry much of the load. Electric winch makers usually publish a maximum boat weight directly. Bunk trailers, steep or shallow ramps, and retrieving with the boat partly out of the water all raise the load, so move up one size in those cases.
Step 3: Choose single-speed, two-speed or electric
- Single-speed manual: simple, affordable, and fine for jon boats, skiffs, PWCs and small runabouts.
- Two-speed manual: a low gear for the hard pull up the bunks and a high gear to take up slack quickly. The best value for most 17 to 22 foot boats.
- Electric: push-button power-in and freewheel-out, with a hand crank for emergencies. Worth it for heavy boats, steep ramps, solo launching, or anyone with back or shoulder concerns. It needs a heavy-gauge circuit from the tow vehicle battery, typically through a wiring harness supplied with the winch.
Handle length matters on manual winches too. A longer crank, for example 8 inches instead of 6, gives more leverage, but needs clearance from the bow and the winch stand.
Step 4: Pick strap or cable
| Line | Pros | Cons |
|---|---|---|
| Polyester strap | No sharp frays, easy on hands and gelcoat, stores less energy if it breaks | UV degrades it, replace every few seasons |
| Steel cable | Very strong, abrasion resistant | Frays into sharp wires, rusts, whips violently if it snaps |
| Synthetic rope | Light, strong, low snapback | Needs a winch designed for rope, wears on sharp edges |
For most recreational trailers, a 2 inch polyester strap rated well above the winch capacity is the right call. Heavier boats often use 3 inch straps. Inspect the strap every trip and replace it at the first sign of fraying, cuts, stiffness or sun fading. Never stand in line with a loaded strap or cable.
Step 5: Mount and use it correctly
- Set the winch height so the strap pulls straight or slightly down to the bow eye, not up at an angle.
- Use grade 5 or better bolts with lock nuts on the winch stand.
- Keep at least a few wraps of strap on the drum at full extension.
- The winch is not a tie-down. Add a bow safety strap or chain to the bow eye for the road, plus transom straps.
- Grease the gears and check the pawl or brake each season.
Our trailer parts guide covers bunks, rollers, tie-downs and jacks, and the bearing and hub guide covers the wheels underneath it all.
Common trailer winch mistakes
- Sizing from dry weight and forgetting engine, fuel and gear.
- Trailering on the winch strap alone without a bow safety chain.
- Keeping a frayed strap or kinked cable one more season.
- Cranking the boat up a dry ramp instead of floating it onto the bunks.
- Undersized wiring for an electric winch, which causes slow pulls and hot connections.
Our picks by boat size
All in stock at Boat Supplies Direct.
Skiffs, jon boats and PWCs
Powerwinch Utility 1,000 lb or the Load Rite 1,100 lb Single-Speed with 20 ft Strap.
Runabouts and bay boats
Powerwinch Select 1,800 lb Two-Speed or the Attwood 2,000 lb Dual Drive Winch with Strap.
Larger center consoles and cruisers
Powerwinch Select 2,500 lb Two-Speed or the Powerwinch Utility 3,200 lb Two-Speed with 11 in Crank.
Electric winches
Powerwinch RC23 Electric Trailer Winch with remote, or the Powerwinch 712A Electric Trailer Winch. Both are rated for boats up to 7,500 lb and about 17 to 23 ft, with a 20 ft strap and 60 amp harness.
Replacement straps
Rod Saver 20 ft Winch Strap with Safety Strap, the Rod Saver Heavy-Duty 3 in x 20 ft Strap for big boats, or the BoatBuckle 2 in x 20 ft Strap.
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Frequently Asked Questions
What size trailer winch do I need?
Start with your total loaded boat weight. A winch rated around half to two thirds of that weight suits roller trailers on moderate ramps, and you should size up for bunk trailers or steep ramps.
Is a two-speed winch worth it?
Yes for most boats over about 2,500 lb. The low gear makes the hardest part of the pull much easier, and the high gear takes up slack quickly.
Is a winch strap better than cable?
For most recreational boats, yes. Straps do not fray into sharp wires, are easier on gelcoat and store less energy if they fail. Replace them when they show wear or sun damage.
How long should a trailer winch strap be?
Most trailers use 20 to 25 ft straps. Measure from the winch to the bow eye with the trailer at your usual ramp depth and keep a few wraps on the drum.
Can I trailer my boat with just the winch strap?
No. Always add a bow safety chain or strap and transom tie-downs. The winch holds the boat against the bow stop but is not designed as the only road restraint.
When should I get an electric trailer winch?
When the boat is heavy, the ramp is steep, you launch alone often, or cranking is hard on your back or shoulders. Wire it with the supplied heavy-gauge harness and a proper fuse or breaker.
This guide is general information. Follow the winch and trailer manufacturers' ratings and installation instructions, inspect straps and hardware before every trip, and comply with your state's trailering and towing regulations.
