I know how to add trucks and loads.
Their are boats in all the terrains. I suggest you swap your one for one of those. Simply open the relevant terrn file(in terrains) in notepad and swap the old boat filename for the name of your new one. I suggest the wahoo in aspen.
"I see your point, and you are 100% right" - khadner http://theoatmeal.com/comics/religion