Isn't dune riding more suited to something lighter and more powerful?
I knew someone with a Polaris 400 4x4 Sport and he was hard as hell on stuff. Never had a problem while he owned it.
We had a 250 Scrambler here for a while. I didn't have any issues with it and the reverse override was a hoot (dangerous).
If you were to say, forest riding, that's one thing, but dunes and hauling firewood...that's a tough one.
At that price range too. Then again, with the SxS craze in full swing, maybe used sport quad prices are less than 35 year old sport trike prices.
The story of three wheels and a man...