Troqueer Garage in Dumfries showcases used cars using a customised child theme of the CarListings theme. Auto Listings plugin allows for child themes as well and Smush provides the image optimisation for the multi-image galleries associated with each vehicle listing.
What was interesting about this project was the migration path from a legacy VBScript site with a content and vehicle listing system, that relied on masked redirects to promote different vanity urls, but without SSL capability, to a WordPress multisite environment with parked domains, each with SSL padlock protection and a distinct theme design and presence.