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Just use KBB or Edmunds. I disagree that those resources don't value lifted trucks correctly. Those sites don't add value for lifts, because lifts don't add value. In fact in the minds of many, lifts deflate the value of a truck. And the higher the lift, the more value is detracted. Overall, a lift is a push at best.
For that particular truck, a very nice looking one BTW, I would use the usual online resources and not let a salesman snow me.