[stevenwoo]

I don't know how to access the dealer site in the article, but the consumer site lets one pick multiple makes with the more search options button. The UX doesn't make this obvious that this is the way to do this, but that is a different issue.

[Redsquare]

I really cant see that, just allows a single selection.

[stevenwoo]

If you select the search options button in the Search group box, it brings up a new page. That page has multiple group boxes for selecting separate make/model combinations for a search.