My wife & I recently got back from a vacation to the western side of South Dakota. We did some wheeling in The Badlands National Park & The Black Hills National Forest. The Badlands only has a few dirt roads that require high clearance vehicles. As in all National Parks. Off road driving is prohibited. But the areas where you can drive the high clearance required, leads to some awesome views that most visitors to the parks don't get to experience.
The Black Hills National Forest has several thousand miles of trails dedicated to highway legal, non highway legal, quads, dirt bikes, mountain bikes, hikers, & horses. There are plenty for everyone. The National Forest website even has a download for Garmin GPS, along with a map this download is an excellent tool for doing these trails. They are marked as to their allowed vehicle type even on the GPS. But you need the maps to determine the usage.
We drove many miles of dirt roads & mild trails. We did one trail that is considered difficult & was apprx 7 miles long with several dry creek crossings that had very large boulders that we crawled over and some were 100-150 feet long The rock beds, not each rock). A good spotter , rock sliders & skid plates made this trail an easy run for the FJ. Unfortunately we took no pics on this one trail. I do have a few pics from some of the other trails & roads I will post.
If you ever get the chance to go to SD, it is well worth the trip. We went to Colorado last year & I think this area ranks right up there with the trails we did in the Breckenridge Ridge area.
I can't seem to remember how to post pics.