I think of it like this, when you drive by someone with just YOUR info on the side you have 100% chance for that potential customer to see your sign. Therefore, leading to more work for you. Now, say you sell 20% of the room on the side of your truck out for adds.. You now only have 80% chance for that potential custom to read your sign and not the adds. So it's just up to you, do you think the money made by adds will be more than a lose of 20% of potential customs seeing your sign? This is just theory, not hard facts. But you understand where I'm coming from.
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