Built by the owner it was built for.
I'm a dealer. For years I paid for the same stack you do — a dozen add-ons, each great at its one small thing, none of them talking to each other. Another login here, another invoice there, another vendor holding a copy of my customers' data, at my expense. I added up the monthly bill once. I don't recommend it.
What I wanted didn't exist: to know what we made today, without waiting for accounting to close the month. To know whether the money on Meta, Google, CarGurus and AutoTrader was actually coming back. To know that the customer shaking my rep's hand on Saturday had been on our site three times that week — and what they came to do. To run the store proactive, instead of reactive.
So I built it — on my own showroom floor, against my own deals, with everything this business has taught me since 1999. GhostDrive is the software I always wanted someone to sell me.