Hey Dave,

I don't have a picture, but I'll describe what we use, a variant of what started as the "Lemme Slide" (invented by Mike Lemme using two old snow skis).

Take two lengths of electrical conduit and attach between the front and rear trailer crossbars, about a foot apart from one another. You can then slide the Cat Trax all the way under the boat from behind the trailer without having to worry about picking them up to get over the front trailer crossbar.

It helps to use end caps so you don't cut your legs up on the corners of the conduit.

Works great for Hobie 16s. Your mileage may vary with lower-profile boat crossbars.

Hope this helps.

Mike