Copyright concerns are a valid issue in our litiginous society, so you should be in CYA mode at all times in the public domain. It's sad, but true. Otherwise you're sued.

As for the print, something more like "All images, trademarks and copyrights represented are property of their respective owners". That way you've got both Isuzu and Isuzu America covered, as well as whatever firm actually produce the advert.