Generally, boats that require a cradle or stands to sit on a flat bed trailer are not trailer launchable. Most ramps aren't deep enough to allow launching of a keel boat off of a trailer, especially a flatbed trailer with a cradle or stands attached, since that increases the height of the boat off the ground and effectively increases the depth needed to launch said boat. IMHO, they're not trailerable boats technically, they're boats that can be stored on a trailer and moved with a trailer.
Also, consider that trying to clear the cross bar on the trailer pictured would require another THREE feet of depth for the launch ramp--which just ain't gonna happen.
A flatbed trailer with cradle or a cradle trailer like the one shown are great to have since they allow you to transport the boat reasonably easily, but they WILL REQUIRE A CRANE OR TRAVELLIFT to get the boat on and off of the trailer. They're great for winter storage and for doing maintenance on the boat.
Most keel boats are not going to be ramp launchable. The ramps aren't deep enough, and if they were, the truck would have to be too deep in the water to be safe unless you have a fairly long tongue extension.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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