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Trailer hitch extension Make a square slip tube, the same size as the one on your hitch on your truck. The tube needs to be smooth (no weld) on the inside this is very important contact your local steel supply, they’ll know what you’re looking for. Make it reach the first cross member in the trailer. This is where you cut the tongue off and replace it with this tube make sure it’s welded in by a competent welder. The smaller tube can be made whatever length you want. You can drill a hole through the tube for a pin or bolt (you can use the dimensions from your receiver hitch this will be ample for any size boat you can put on a trailer) you also need to drill a second hole in the inner tube about 12 to 14 inches from the other end for full extension. The tongue san be bolted or welded on the end of the inner tube. This gives you the strongest permanent extendable trailer that looks like it was done from the factory and best of all you don’t have to unhook your truck to extend or retract it and if you use a spring loaded pin you can do it by yourself From the folks at P.W.T.Engineering
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