You can add manufacturer badges to the home page in Autos Pro to show off which car manufacturers you deal with.
To add these, go to Badges -> Add Badge and add the title and upload a logo using the featured image box. Images are resized to be 50px wide here, so uploading a larger image should be fine. There is also an option in Autos Pro -> Theme Options -> Homepage to hide/show the badges section.
Badges are ordered by date added, with the most recent first, so to change the order, simply amend the published dates into the required order.