Thanks Mora! I can't tell you how great it's been to have a box that is accessible. I've even added a table that hooks to the side for remote camping.
Thanks for the heads up on the bolts in the fender. I'll take a close look next time I have it out of storage.
I'll try and remember to take a picture next time I have it out. The setup was pretty easy though. The box is 4x8 and the platform the boat sits on is 5x10. I framed it similar to how you'd frame a wall. 6" in on the long sides (made it so it would open on up on the passenger side of vehicle) , I ran a set of 2x4's to hook the hinges too. I used 4 standard hinges. Then, using a bit of muscle, I screwed the hinges to the box. The two gas struts I picked up at a trailer store for about $30.00. I think they were 130lb's each.