well FYI, I just pulled a Manheim NADA Dealer only quick search of 08 V6 SR5's. this is what they sell for at auction right now. NOT certified warranty for another 30k and 2 years(has to be worth at least $750-1000), NO LIFT(at least $500), NO bigger tires(my dealer cost is $150 each =$600 plus mount and balance and alignment = $800 easy), radio amps and sub another $800 plus install. about roughly $3000 in add ons, as far as i can see from his sig
so a comparable truck that just sold is the 10/16/13 san antonio truck for $13500, but you will have to factor in they will get it retail ready, transport, certification, ect then it becomes a $18995 retail truck with NO mods.
Plus side is buying a truck from someone that will be honest and upfront about it. i hate the NOT knowing when i buy a used vehicle. dealers are snakes. if i can buy private i will, if i have to buy from a dealer, it better be a great deal OR it has to be a NEW vehicle.
I dont know either of you guys BUT on paper it seems like a decent deal. I can run a carfax for you guys if you interested. Just let me know.
Good luck!