The two wires in the back of the dash will not supply 110V. I am really not sure what it is for but it wont work even if you just buy the plug. You would have to add a power inverter and wire it up to get power. You would have to find a 12V power source to power the inverter and turn off when your truck is off. There are some posts about this long ago. I haven't had time, but I do plan to figure it out soon.
You would pretty much have to wire the inverter, than wire to the OEM plug by splicing or building a harness for it work (What I plan to do).