My suggestion would be to do a Google Search (or Google Image Search) for 'balloon decorations car dealerships' or 'balloon decorations auto dealerships'. I found this website which features nice images of possible balloon decorations for car dealerships.
Also, keep your eyes open when driving round your area. Perhaps you'll spot some live examples for balloon decor in auto dealerships.
I haven't done this type of decor myself, so can't really give any personal recommendations.
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Can you please tell me how low and high temperature, humidity, pressure, sun and other atmosphere factors affect balloons inflated with air and balloons
I need to send balloons out of the United States for a sweet 16 celebration in another country where they don't have access to helium... What kind of balloons