If you don't give a *#$* then why paint it in the first place? All of my trucks follow a certain look to promote the image of the company and to speak for us as to the quality we do. I do have two dedicated plow trucks that are blank but we'll be adding something to them just to put the name in front of people while we're out there cleaning their streets.
I have issues with safety in Isuzu's. Would I buy one though, yes......but what am I getting with a 16' box with an Isuzu cab vs a GMC cab. Both have 6.0L gas engines but one costs a lot more ($3k+ each). Also, a used Isuzu is likely not to be a fleet maintained vehicle with records.