In today's auto market, I bet you'd not get more than 6k trade in. Private sale maybe 8k. Mods don't mean a whole lot for resale value unless you find that 1 person who wants exactly or close to what you have done.
I got my Edge Plus 4x4 totally loaded with 70k miles from a dealer for about $10k I believe it was. That was the dealer price too so I know I overpaid a little bit.