Just what do you mean when you say, "fully loaded?" Are you packing like a backpacker, or packing like me when I go kayaking... not quite so light, let's say.

A baidarka with a single-piece keel should be able to withstand a great deal of load without any trouble. The articulated keels will definitely flex more, but if you're careful about where you place the slings and don't go too crazy, you won't have a problem.

Good luck, and have fun!

Nathan