Dude, IMO you have been far too nice and have avoided raising serious hell for whatever reason.
The dealership should be the main focus of your campaigns. Park the truck OUTSIDE the lot with huge signs all over it, post on social media, talk to local news etc. Spend a sunny weekend walking around their sidewalk with a giant billboard.
Youre out how much? 20,000$?? My god I would have lost it ages ago.