Agree with BigB and e57. Remember, most of the poeple who see your truck have about 2-3 seconds to get your info. You're promoting for the "on the move" moment, not the "sitting at the jobsite" mindset.

COMPANY NAME
Type of work
PHONE NUMBER
Additional info

ABC ELECTRIC
Residential-Commercial
(123) 456-7890
Licensed/Bonded/Insured (or Lic. # if Req'd)

KISS is definitely in effect for this.