I have a couple trains of thought: The first is that you should stongly consider posting your ad on a national general used car forum (just Google “Used Cars,” and the first one(s) that pop up will allow you to cast a wider net). I say because I question the benefit of posting on a Chrysler 300 forum where 99% of us already owns a 300… Of course every now and again somebody wants another, but that is more or less an anomaly. I think you understand my point.
Also, I think you are much too detailed in your description of features. Honestly, people hate to read more than is necessary and like things succinct. You make them work too much; and if you do, they’ll just move on. Also, when you parse out something like, say, “Satellite Radio(expired),” people might say, “Oh forget THIS, it’s expired!” Similarly, when you say, “A/C just serviced to fix a leaking valve; works great now.”, folks only see the word “fix” and wonder if your car is a basket case. You do yourself and your sale a disservice by giving people too much to wonder, worry, or feel they need to then ask questions about. Let THEM ask you questions about what works or any problems – no need to poison the well unnecessarily – and it will help you get bona fide parties contacting you for additional information. I would just mention the main features, and at the end, ensure you emplace the words that you’re selling the car “as is” (i.e., that there is no implied warranty). This protects you should something you disclosed or didn’t disclose goes wrong now or down the line.
Lastly, the earlier poster is spot-on. Almost everybody will pass on your ad if you don’t include a photo or two. When you take it, make sure you remove any boats, motorcycles, OTHER cars, cluttered yards or garages, or I support Trump/Hillary signs in the background. Make your vehicle the focal point, give them no reason to speculate on or view any and everything else. Also, wet down the driveway where you will take the picture to get that beautiful reflective-type image that makes people go, “WOW!” and has them remember YOUR car over another’s advert.
Those would be my suggestions. Best of luck.