Since your going to Windrock I would suggest getting 4 u-bolts to attach it to your rack. You'll have to drill the hole in the box but trust me it's worth it. We go to Windrock at least once a month and can get rocky up there. The club has been working several trails so it might be a little smoother right now. You could do like H4 said just make sure and get the straps tight because you'll be doing some bouncing on the rocks!
Make sure and check out the Windmills on top of the mountain while your there also take some goggles because it can get dusty on the gravel roads. Have Fun!
Make sure and check out the Windmills on top of the mountain while your there also take some goggles because it can get dusty on the gravel roads. Have Fun!