Quick suggestion....Give guidelines to dealers. Like description shouldn't be longer then....your title tag shouldn't be longer then....your keywords shouldn't be longer then. You get it? I like it though. Thanks for giving the control to the dealer. Says a lot about your site.
Speaking of control by the dealer, is there value in terms of SEO for putting links to other high profile organizations on your site to increase your rating?
I used this example in another thread, not for SEO, but if your dealer was involved with a group like Habitat for Humanity, would having a page on your site, perhaps on your ABOUT page that blogs about your work with Habitat do anything for you in relation to SEO?
I know the value it has for visitors, but Im curious if having a their banner on your site would help search results.