find TWO 4" or 6" pipe (what ever fits over your forks). preferably metal. slip them over your forks. you now have extended forks. drill a hole in pipe nearer to tractor. so you could toss a wire through and wire the pipe back onto the main frame of the forks. to help keep the pipes from sliding off the forks when you uncurl the forks, and let the kayak slide off the forks.
if you have having physical problems with that much weight out in front of you (primarily due to length sticking out in front) then see about getting some caster wheels. so they are free to spin in any direction. if you end up needing casters. you will most likely need to make a BOX frame, and then X support framework inside the box, then an "angle brace" per pipe. to help strength things up some. example of caster wheels, would be the "larger wheels" on a finishing mower deck. local hardware stores might carry a larger caster wheel. larger the diameter the better, so you can deal with little bumps and like better. without causing the wheels to dig into the ground.
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find the cheapest "lawn cart" or "little trailer" for a riding lawn mower. as long as it has 2 wheels that spin freely of each other. extend the "tongue" X amount of feet so you can turn it into a long "trailer" with kayaks center setting over the wheels of the trailer.
extending tongue, could be a piece of pipe. with some holes drilled through it. to i really do not see it happening, some lumber some how extending the tongue.
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hit craiglist, and find the cheapest boat trailer you can find. that is long enough and short enough in width to get into the storage building. heck you might find one with a hand crank winch. with 20 plus feet of cable on it.
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there are "boom poles" for FEL, but every time i see them, they tend to be DIY jobs. welded up out of some metal. and most of the times, they are either used to set "trusses" for a house or building, or lifting up sheet metal to a roof, of a pole barn building.
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they sale axles, wheels, mounting hardware for axles, to DIY something at most large hardware stores (i know at least menards does) more so give it another month if not already in the lawn / garden section inside.
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a bit more expensive, get some 2x4's, and building yourself a "cube" with a top and middle shelf. toss on 4 caster wheels at 4 legs. and pull it around like a wagon. unload/lead kayaks on it. and store it as a "large shelf" in the building.