If I had the tools that are available today when I was on the sales floor, there would be no stopping me.
I taught myself how to build websites using Frontpage and would advertise my website (VWrep.com) across traditional channels to build traffic - mainly my stickered out New Beetle with VWrep.com and DriversWanted logos all over it. I could go on and on about how I branded myself but that's not what this thread is about. I do know if I had Facebook, Twitter, Instagram, online Video, and easy to manage blog programs like we have today - I would never take a fresh up after the first year of being on the sales floor.
With my simple Frontpage website, after about 2 years I was attributing over 6 organic sales a month and it helped me close many more. This was 2001ish.
During my dealer visits, I usually run across a sales person that utilizing facebook at it's minimum (2 work related posts a week) to help them acquire 2-4 sales a month. With some training and upping the frequency, I believe it would be feasible to acquire 6-10 sales or more a month.
Go full-on branding across the social mediums, tie in some video, utilize an online ratings service like DealerRaters individual employee rating pages, start your own email campaign service (like EZPZ) and brand yourself as the "Go to Professional" in the local area for that make of vehicle - 10-20+ cars a every month would come easy once you had it built out with a good following.
The question I have is: do you have 2 facebook profiles? One for personal and one for professional? Or do you say "F" it and tie to the 2 together?