I also like to play in the sand dunes at Little Sahara state park in Oklahoma (about 200 miles from my house) on my Yamaha Raptor 660R.
It's been lengthened & widened for the dunes & has very few stock parts left on it!!
I also race sand drags with it,
I'm about to start building a dune buggy (VW powered of course!) to play with in the dunes, all day on the Raptor can wear a guy out, I want to kick back in a buggy for night riding!