I ran for two companies for about six months. It wasn't worth the bother, I'm still with the company I leased on with at first. The second outfit I have serious questions about, seems I never was able to get information out of them so I could get signs made. No MC numbers, no DOT numbers, nothing. I sat about as much working for both outfits as I do just driving for one, so no difference there.
About running ads on my van: I thought about it, but I honestly don't see it producing enough revenue to make up for the extra headaches it would cause, so--- nope, not gonna do it. Most of the big, nationally recognised brands already have their advertising figured out, and the local joints won't get much good when I'm out of the area.