I built the trailer to handle an ATM of 1950kg and have a 1 ton pay load. The top kart is lifted up from the centre kart runners by a remote electric winch controller. When the kart is lifted to the top position I flip up the boards under the kart, then lock them in and load the 3rd kart into the middle position. I can unload and load all karts by myself. Using my kart trolly which I made with wind up scissor style platform from ground level. I use an electric drill to raise the trolley.

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