I bought mine a few months ago when the most you could get off at any dealer on a loaded Longhorn or Limited was around 10% (see cumminsforum fifth gen section for a long thread on this). I pitted half a dozen dealers against each other and couldn't get 14%.
I'd say you're in good shape with 14%, and will love the truck.
Asking for $65K out the door will probably get you laughed out of the dealer, as previously mentioned. I would consider a $65K OTD offer on an $86K truck already discounted to $74K rude, and justification for brashly escorting you out the door.
