Consider using your business truck(s) as your largest form of advertising.  It is far more effective than telemarketing or direct sales calls.

When you think about commuters and how much time they spend on the road each day, you know that they are more than likely working over problems or tasks that they need to get done while they are waiting in traffic. If your business offers a service that they need, they are going to see the bright truck graphics on your business truck and the seed will be planted in their minds. If you have a window repair service and they are staring through a cracked windshield, seeing your truck wrap may give them the nudge they need to get it done.

By having truck wraps, you're reaching many more potential customers and doing it in a way that they don't feel you're intruding. People are much more likely to buy when they are already in a shopping or purchasing frame of mind and seeing your truck wrap in the local mall parking lot is likely to receive a more positive response from potential customers.