This contractortalk.com thread addresses the question: Should you 'sign' your vehicle -- and if so, how.
The consensus is "yes", both for direct inquiries and as a branding strategy -- people who see your well-organized truck will be more receptive to speaking with you for business.
But there are some cautions and exceptions noted:
- You need to watch out for road rage and you (or your drivers) had better be careful and sensitive or you will hear from them -- or the police!
- If you wish to park your truck at home in a residential area where business vehicles are restricted, watch out for the parking and zoning bylaws!