Building a KARA Hummer Layout Duck Boat #22: Triple-Stack Trailer Modification

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Blog entry by DustyMark posted 09-08-2015 02:25 AM 7869 reads 0 times favorited 0 comments Add to Favorites Watch
« Part 21: Fabricating the Flip Blind Door Frames Part 22 of Building a KARA Hummer Layout Duck Boat series Part 23: Sewing the Flip Blind Doors »


The three layout boats are done and we modified my brother’s trailer to haul all three of them in a stacked configuration. Our set-up requires a frame to hold three boats, a set of ramps, and a cart.


The frame is constructed with pressure treated 2×4’s held together with bolts and lag screws. Each bunk has a strip of wood that mates with the outside edge of the runners of the layout boat. This helps keep the boat aligned on the bunks.

The frame is connected to the trailer with four 1/2” bolts. The lower bunks fit between the bunks for the regular duck boat so all my brother has to do to reconfigure the trailer is remove the frame and reinstall the original bunks.

We load the boats from top down and unload them from the bottom up. Eyebolts provide points to attach the tie-down straps.


At 160 pounds, these boats are too heavy to readily lift onto the second and third cradle. Our method is to use ramps and bring the boat up the ramps with the cart.

The ramps are constructed of pressure treated, 10’ long, 2×12’s and are reinforced beneath with a 2×4. I already owned a set of ramp caps to hold the ramps in position.

The ramp angle for the second level is reasonable. It is quite steep for the third level, but two guys can haul it up with the cart without too much fuss.


The cart is essential to moving these heavy boats up the ramp safely.

See my previous blog entry for details about the cart. I will install an eye bolt in the front edge of the cart frame. This will provide a tie-down point to rope the cart in position once the boat is at the right height in relationship to the cradle.

We’re looking forward to launching all three boats together for the first time!


In the next installment I’ll discuss sewing the flip blind doors.

-- Mark, Minnesota

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