I bought a Kolpin Navigator box for the rear rack of my Yamaha Grizzly 700, but it seems a bit...flimsy? Does anyone have any experience with this trunk? What about the NorthCoast Rigid box (they manufacture OEM for Yamaha) or the Montana Jack Deluxe II? I'm inclined to put a box on rather than a drop rack, so as to make access to the hitch a little easier and to have locked, dry storage. I'm willing to be convinced otherwise, though.