How to Determine Correct Winch Capacity for Boat Trailer

Question:

I have a 30ft 9500lbs boat that sits on a trailer with carpeted bunks would a 2600lb winch be sufficient?

asked by: Debbie N

Helpful Expert Reply:

The general rule for winch capacity relative to boat weight is that if wooden bunks are used the winch should be rated for at least half the boat weight, a 2:1 ratio. If roller bunks like # DL21741 are installed on the trailer this dramatically reduces the winch's work load and a winch rated for 1/3 of the boat weight would usually be sufficient, a 3:1 ratio. The incline angle when winching also affects capacity.

Just the same, any product like a winch or jack that is used well below its maximum rated capacity will typically last longer and work better.

There are pulley blocks like # BDW20023 that can be used to increase the winch capacity. These are covered in the linked article on winches that you might find helpful.

expert reply by: Adam R