Today, we made it out onto the dunes at Little Sahara State Park. Wow - so unexpected to find in western OK. This was our first experience on the sand, so we "learned as we went."
We loved the campgrounds, and basically had the entire campground (and dunes) to ourselves. The locals said they aren't busy during the summer as it's too hot - so I think we got a little lucky with the weather (even with the crazy wind).
100% recommend you visit this area and take your rig out on the sand. Also 100% recommend you don't go alone :)