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They are pulling a dune slowly.
I am standing on top of my four-wheeler for this video. You really don't get a good grasp of how tall these dunes are until you are there. They are from 80 to 100 feet tall. We're at the top of a dune and those four-wheelers are at the top of another dune. The dune drops off just on the other side of the orange buggy. We rode the tops of many dunes. It is marvelous fun!