I built mine for the crossbars to telescope. On the front, there are two flat pads that are wide enough to tele the boat in and out, without the crossbars having to go with them. They're a couple of feet long, front to back, but I would have to measure the width, because I built it in 1988. It also has a removable second stack for carrying two boats. That front pad also pivots to fit the bottom rocker however it needs to. Those pads are made from two sections of treated 2x12's, covered with carpet.
The back crossbar also telescopes, but has 2-12" urethane rollers on each side. Those rollers are wide enough to telescope the boat by starting up on the edges of the rollers.
I used a semi-truck cargo bar to push the hulls out to insert the bolts, without having to take the tramp off.
There is also a pivoting A-frame on the front for raising the mast. With a winch, it has enough mechanical advantage that no further shroud tightening is needed. A couple of trap wires did the mast raising. It didn't/doesn't take me long to rig the boat.
On the back is a removable mast carrier with a roller. That rear mast carrier fits in a socket that also has a horizontal storage position to have somewhere to keep up with the mast stand, and still get it down out of the way.
There are pictures of it somewhere on these forums. I had it hot-dipped galvanized, and it still looks like it wasn't made very long ago.
I have the second stack parts, including different mast stands to carry two masts.
It went all over the country during the Prosail series.
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