This damned lake (Army Corps of Engineers) recreation area offers some very inexpensive camping and OHV trail access. When the water is full during the summer, the lake is good for motoring, fishing, and other water sports. We visited during the draw down which offered a lot more beach area, but less water. 

Many of the campsites offer full-hook ups with all the usual amenities, picnic table, grill, sun shade and fire ring. A few of the campsites lie along the rim of the canyon and are way more beautiful, offering more privacy and sweeping vistas, but do not offer water or electricity. Bring your own solar panel and water and you are all set! 

Bathrooms were scarce, none close to the campground, unless we missed them, but there were some toilets by the office/campstore. So, come prepared with your own facilities, too if you don't have one in your RV.

Closest town for groceries and supplies is Plainview, about 45 miles away.