Selling Truck-Cheap?

Just purchased a used Class C so no longer needed the 2007 Chevy half-ton truck that we used to tow our small 5th wheel. I thought it would be relatively easy to sell for $16,000 or more. But after 2 months of trying, mostly on Craigslist and being very frustrated by kooky callers, etc, I sold it to a dealer for $13,700. A really nice ext. cab truck but with 98,000 miles. I'm not sure if I gave it away or got about what I would have for trade-in but now I don't care because the stress is gone and we can move on. Just wondering if others have had this experience? Incidently, we sold the 5th wheel easily(by luck) and got a fair price.