Miles are good 16,000 per year, means it was driven daily which is a good sign
As far as price, you would have to look at local "buy and sell", truck trader and craigslist, pickup truck prices vary by area too much for me to guess at it

Look at the ASKING PRICES to get an idea of the local market, you can even make a call and ask what it sold for.
The BUYER sets the value of a used car, not the seller.
Seller wants the most he can get and buyer wants to pay the least he can, if a deal is made then that is the Local Value of that vehicle.
Local Ford dealers offer a Used Vehicle inspection, usually $125-$175, not a bad investment if you are a serious buyer, they often find little things that can add up and when you go to negotiate a price you have those things to mention and maybe get $200 or $300 off the price, so it really costs you nothing
If seller won't allow the inspection then that should tell you something, up to you if you want to continue.
If inspection finds a major problem, then money well spent IMO.