Interesting picture, but not sure that would be the best one in trying to sell it.

 

As has been said, look up kbb, nada, black book prices for private party in the condition yours is in. That's private party value. Also look for recently sold similar trucks in your area (not asking price but actually sold). Reach out to some of the sellers on Facebook, offer up, Craigslist and ask them what they sold their truck for.

Trade in will be fair condition pricing for trade in value if that.