I once watched as a guy in Alaska built a two story timber framed house on top of a 30ft boat. As he continued, the water line got lower and lower, but since it was summer time, winds were minimal. Once big winds arrived, probably the only thing that kept it from tipping over were the dock lines. In November I headed to Baja and when I returned, it was gone. I have no idea what happened though, but it was damn top heavy.
Agile Ride improvement package