I took the basic large beach cart with rail kit and modified it to this. The reasoning being the cart worked great on the whole but with one big issue, how to get the heavy kayak on it. It was always a bear to lift one end and swing the kayak over the cart and strap the cart to it. If you laid the kayak on the side and tried go that route the cart would just push out.
I pictures will show you the outcome. I removed the rail kit but used its parts minus the small alum tubes. Used 3/4 plumbing PVC conduit with 4 fittings. The fittings are easy to see the design of them. None of these parts are glued, just pop riveted. In 2 of the pictures you'll see which scupper holes are used, by the front tackle hatch and the ones on the rear deck. I made nothing more than a square frame, used the quick release pins to mount to the cart, drilled holes at the top of each of the pipes that go through the scuppers and used quick release snap over clip. I used the padding from the rail kit and reinstalled on the new conduit at the cart location. The rest of the padding is plumbing pipe insulation with a slit and glued edges.
The best part of all this is yes you have to lay the kayak on its side to install, but you don't need the straps anymore. You can pull the kayak back upright, the cart stays in place and doesn't move around. I placed the cart on the frame so it balances it as a teeter totter. No matter which end you want to pull from the weight on your hand is very small.
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