If you want boats for river, lake and inland sea operations, you might want to look at Gibbs Technology High Speed Amphibians:
http://www.gibbssports.com/
They teamed up with Lockheed Martin to develop a concept amphibious combat craft. But it did not make it past the first phase of trials.
Interesting ideas that really has an interesting place in TMP.
If you want traditional boats the best is still truck and trailer to get them to and from a river / lake. Also are multi-wheeled flatbed haulers, TTS make a few of these as well and are used in Asian ship yards.