Cheap Rubbermaid boxes from Walmart???

I can not tell you how they hold up on a ATV, but I have had one in the rear of my Jeep for over two years and it still works great. I have also had one mounted on my trailer for a year and it works great there. If you have a Lowes close check there too. They have a large amount of boxes.

I had one in the back of my Bronco for years. It worked great. Don't expect it to keep alot of water out if you dunk it. I believe they make one that is about 1/2 as tall too. It may be better suited for an ATV.

i had one one the back of mine for about 8 years and it still works great but i just recently took it off so i can double ppl on it

I use a similar box for hunting. I just remove the rear passanger seat and use ratchet straps to secure the box to the rear rack. The straps keep the box from bouncing around and just make sure that it is tightly filled with softer items like extra clothes to keep things from bouncing around inside. It's also a good idea to pack the contents in plastic bags to protect against water and dust on the trails.

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!

I HAVE ONE MOUNTED TO THE TOUNGE OF MY UTILITY TRAILER. IT WORKS GREAT AND THERE ARE HOLES TO PUT LOCKS ON BOTH LATCHES IF YOU DO NOT FEEL SECURE THE WAY IT IS

They are awsome!!!Here's a pic of mine........