Hi Stuart,
My tilt trailer design has been very useful for me over the past 1.5 years. It has the ability to carry in dismantled or tilted mode. It can also carry two boats at once (one titled, one dismantled). For long distance trips I dismantle the boat. I have towed tilted in reasonably strong winds (~15-18 kts) without any problems. Remember, if you're doing 50-70 mph, it's basically all going to be headwind anyway (until you slow down:-).
I can use my design as a launch platform to float the boat off or on to the trailer, unlike the Tilly setup further up this thread.
I regularly need to put the boat on or take it off the trailer single-handed. I place the beach wheels under the transoms at the back of the trailer...grab the rear beam and pull the boat backwards until some weight gets on the beach wheels. Then move the bow, lift one bow enough to allow boat to slide back in the cradles and let the beach wheels roll the boat back. Return to the rear beam, lift up enough to kick the beach wheels forward some more. Repeat this process until the wheels are at the balance point (about 2 after of main beam).
Putting boat onto trailer is basically a reverse of this process.
The Tilt mechnism is dead easy...lash the low hull into the two cradles, attach the winch post line to the main beam at the inner gunwale. Use the hand winch to lift the hull all the way up to the top of the post so that the upper side of the main beam comes to rest under the wooden chock at the top of the post. Tie off a failsafe line for added insurance, stow the two swing-out support arms, secure mast below tilted boat, hitch up the Mini Cooper and you're done!
Mike.