Gary, thanks much.
We like visiting Native American sites in the West. We even camped in our Class C on a reservation once just outside the Badlands and paid a tribal member to drive us around the reservation to see where and how she and her friends lived on the reservation. Very interesting and informative.
The longest and worst offroad drive we've been on has been the one out of Plush, Oregon going to/from the Sunstone sites. This was about 25 miles each way at 7-10 MPH because of extreme washboarding. Our next worst drive has been on the "RVs Not Recommended" route within Monument Valley - no washboards but several whoop-dee-doops, ruts, and side-slanted road surfaces.
You are right-on with the key being to go slow! Most posters in the forums don't consider a Class C as basically indeed "a truck" and capable of going to/through the same kind of situations that a pickup truck is. Ours has the same ground clearance as most stock 2WD pickup trucks and run-of-the-mill stock SUVs do. However, pickups and SUVs do have a much better rear departure angle than even a short Class C has.