I have to be honest, it isn't pretty but that machine is a beast. We took one to Brimstone, TN and were trail riding with it in the pooring rain. It outdid the Rhino & Teryx 10x over. It really is a working machine. We climbed muddy rain drenched hills, up through ruts and mini watefalls. It never failed us 1 time. The Rhino & Teryx both had to go aroud a couple of things we went right up, it was awesome.
But at the end of the day, anyone on here is never going to own one, I seriously doubt it is good for the dunes. I would look at some of the local farms or ranches in the area. You could even go to a dealer and find out if they can give you contact info for those who purchased any. Just a thought.
Or call Tim @ Honda and see if he can help you. You never know