I hate to be the bearer of bad news but I went to your website and you have already shot yourself in the foot in so far as the Google rank of your inventory pages are concerned. You are making a HUGE mistake by depending on a company that frames your inventory content instead of having it hosted under your own domain name. Doing a Google search for all pages under your domain, Google sees no cars for sale at all coming from your domain name. This is because all your cars that you have for sale are all listed under another domain (your dealership management system in this case) and all you are accomplishing by doing this is improving the rank of your website provider to the expense of your own domain.
The logic behind this is as follows: I can easily create a site and put a frame in it that contains the contents of any site on the web that I choose. For example, I can frame the entire website microsoft.com in my personal homepage. Google looks at only the content that comes from my own domain in determining my rank. They are smart enough to know that the content that comes from microsoft.com does not belong to me and I get absolutely no credit for it at all.
I know that this has strayed from the initial topic here but I felt obliged to bring it up because I see many dealers making this mistake and since all dealers want to get the best Google rank possible (which does have to do with the initial topic here) I thought I would pass along this important bit of useful information.
Using frames for vehicle inventory is a no no!

