Originally Posted by Night Sailor
Seems like a house boat on a trailer would work better. Launch it and then hoist the trailer on top.
Or just leave the trailer behind - after all, you can't take the tow vehicle with you, so what use is the trailer without it?
I think the basic problem is that trailer layouts don't make very good boat layouts - the lack of open space on 'deck' being one big issue.
There was a British boat that was 'optimised' for use with a trailer. The bright thing was that it sat on its trailer 'backwards' so that the cockpit at the back of the boat was easily accessible from the tongue of the trailer.
What I presume is an enthusiastic amateur has put it back in production, so here is the (less than brilliant) web site: Wilderness Narrowboats
In case it all seems a bit strange, the (very, very old) canal system in Britain settled on a standard lock width of 7 feet, so boats that can navigate the canals have to be 6'10" wide - the same problem exists with the Panama Canal, though at a slightly larger size...