What Capacity Jack is Needed at Minimum to Support 3,100 lb Boat and Trailer

Question:

I have a 21 foot boat that is 3100 pounds on a dual axle trailer came with the boat. The tongue jack is toast. Whats the minimum and/or recommended weight I would need to buy to support the boat trailer? I read your rule of thumb, but I want to ensure I get the right capacity for a safe trailer.

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Expert Reply:

A trailer jack only needs to support the tongue weight, which for a boat trailer is something like 5 to maybe 10 percent of the weight of your loaded trailer, because so much of the weight is at the rear of the trailer. To be absolutely sure you will need to know your tongue weight by using a scale like the BetterWeigh Mobile Tongue Weight and Payload Scale # C51701 or etrailer Tongue Weight Scale # e99044, but we can make a good guesstimate.

With a 3,100 lb boat, since the trailers themselves are usually fairly light you can almost certainly get away with a 2,000 lb jack like the Fulton F2 Swing-Up Jack # F1413230134 or 2,500 lb jack like the Dutton-Lainson Bolt-On, Drop Leg Trailer Jack # DL22320.

I would be surprised if you needed something larger, but if needed you could go up to the 5,000 lb Trailer Valet JXS Trailer Jack # TV64FR.

I have added links below to video reviews of each of these options for you to check out as well.

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Kyle S

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