Yeah I had that problem when trying to make my hull cradles. I had originally noticed it with the rollers, and saw that the boat kept slipping off of them in the beginning, due to improper placement of them. So when I made the cradles I did something a little more complicated, but that works great. It basically entails a sliding track for the rear cradles. Your rear crossbars have to be of sufficient integrity for it to work, though because I drilled holes all over the place(mostly because I messed up with measurements). You basically just measure out all the widths between the bottom of the hulls and do a little math to see how long your tracks need to be (my measurements are available somewhere but based off of an H14). For the track, I just ripped off some stainless steel drawer tracks from an old desk. I imagine closet door ones would work too. Then I just used a few bolts and washers and rivets to build them. For the cradles, I had two from a Cat trax or whatever u call those beach wheels things. Those worked for the rear, and for the front, I used cradles I found at West Marine. (I have no idea what type boats they are normally used for, because they were really thin).
The whole thing is really alot easier than it sounds. Took me maybe 3 hours at most. I might be able to take pictures when I get home in a week or so. Just some ideas to kick around. Good luck
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