Truck Wrap - Vehicle Advertising

I've given it some though and I'm pretty sure I'm going to have vehicle wraps put on my box truck and pick-up truck.

I really want to do something effective. Obviously, I need the company name, phone number and license number but what else?

On the box truck, I was thinking of two different ads; one on each side. For example, a beautiful picture of a tile roof with something like "Tile Roof Experts" in big letter and a blue background. Then on the other side, a big pictures of a metal roof and "Metal Roof Experts" on it with a yellow or green background. This way, as the truck moves through town it will look like two different trucks depending on the direction it's traveling.

What other important stuff should I put on this rolling billboard?

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