Hello Viktor,
A single Dealer's page layout would be enough (in my opinion) please check out this one (as far as I know the biggest car portal in the world with more than 2 million active listings) http://www.autoscout24.eu/Details.aspx?id=217113176 on the detail you press View other vehicles from this dealer and you get the same layout to every dealer http://www.autoscout24.eu/CustomerAr...&aid=217113176
Only importing the dealers Info and Logo with a lighter search filter. This makes all the difference to a dealer at the time to chose the website were he wants to advertise his cars!

Thanks.