http://www.x-h2o.com/threads/130777-Shortened-Hull-Handling-Effects
second pic shows good way to tie your ski down.
Personally I never tie my bars down with a bungee cord because it always keeps constant pressure on the bars and usually ends up making steering sloppy in the end, and second thing I wouldn't do is tie down my ski to my pump, I just don't like thinking about all the pressure put on the pump while in transport and cinched down tight. Steve add some u bolts on the chans bro..
On my Freak I was too lazy to ever add any u-bolt in the rear. I tied the back down by just running a tie-down strap across tray and gunwales.