Don't sell yourself short. Condition is everything, and going by the KBB number is never a bad thing. The price you get will be somewhere between the "dealer" price and the "private sale - fair condition" price. The better the condition it is in, the closer to the "private-excellent" you get, some mods might add to that... Some mods may detract. Dealers only want to sell bone-stock vehicles, where the private party may appreciate a mod for what it does. Aesthetic mods (rims, body kits, huge subwoofers) are all quite personal and will detract from the value.
I'm not saying your CRD has any of these things (good or bad) just that these are the things that can (and will) affect what someone will pay for your truck. Maintenance items don't add to the value if they are done (sorry) but if they aren't done or aren't done properly... That hurts the value a lot. It all comes down to condition.
Take lots and lots of pictures, put them into a Dropbox photo folder and link it here - we will look and give you an honest opinion. If you don't have a Dropbox account, it is FREE and offers lots of cool things - like an extra 500 MB if you use this referral link to sign up:
https://db.tt/EAx8lor