I have the same issue where I sail. It is full of small rocks and horrible shale. I have a Getaway with Rotomolded hulls. The first time I pulled up on shore, I peeled off a millimeter thick 6 foot long strip of plastic from the bottom of my hull. OUCH! I tried to come up with a fancy idea as to how I will make a rolling, hoisting, launching, floating, device to prevent my hulls from more damage. So I went to Home Depot and purchased 6, 10 foot long 2x4's and some screws. Thats it! This is how I assembled it.
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Just connect the dots and you can see how it would look. I thought about pvc pipe too, but used wood since it was easier to put together and looked better on the beach than pvc. Wood is also softer and is super slippery when wet. All I do is slide one end of the skid under the rear hulls and drag the boat up onto it. If I want to plull the boat far up onto shore, I just use 2 more 2x4's seperately and put them under the hulls as I pull it past the skid. Once I pull it onto the two seperate 2x4's, I can pull out the skid and set it aside. When it comes time to launch the boat, I just do the opposite. The total cost of my investment? under $20.
Scott