It's anecdotal, but also widely reported by pretty much everyone who's bought a car in the last couple of years. I bought mine a year ago. Literally nothing but full trim on the lot, and they just took delivery the day before. My friend works for the dealer group, and that's why I bought from him, but it's been that way for a while, apparently.
Of course, if the dealerships want to report what they are ordering to sell, I'm sure people would be interested. The car companies might have the data somewhere in their meeting notes since they are publicly traded, but that would just say what's ordered from them, not necessarily where it goes.
This really is it. I managed a grocery store for years, and the problem these companies have is thinking that the self checkout can replace too many cashiers. Note that it can take the place of 1 or 2, but really, the boon of the self checkout is to really function as the best express lane ever. It should take the heat off your normal cashiers and provide an option best suited for quick purchases under 10 items.
But what ends up happening is schedulers drop their usual front end down from 4 cashiers to 1 and a self checkout host and completely nullify any gains their customers would have gotten from the enhanced service options. People really do like self checkouts but resent the hell out of being forced to use them as a blatant cash grab.