I'm not to sure how many jobs you can acquire through people seeing your trucks but I'm convinced that your truck and all your marketing material should mirror each other. I'm Ok with white because we use that as our background on all our brochures and marketing pieces. I really like Hagopian's purple trucks, there entire fleet and marketing material uses the same purple. They actually have there own paint booth to paint and repair there trucks, in the past you would need something like that. Now with wraps you can do anything you want.
We tried to keep ours simple and easy to read and understand, we do get a lot of customers asking about our other services after looking out at our truck in their driveway even though the brochure we use looks the same as our truck. I don't know who is right but we had a female marketing team work on our logo and design because it was way different than what I had envisioned.