FWIW, I had an old igloo cooler that I picked up at a garage sale on the back of my jeep and never had any problems with it for weatherproofness or durability. The only problem I had was that someone else apparantly liked it and the rack that I made to go with it. <img src="images/graemlins/frown.gif" alt="" /> So no matter what cooler you pick, don't put it on until you're ready to head out.

Chris.