I think if they're buying a fake sewer inspection van they're probably smart enough to find one that doesn't look to people on the Internet like it's a prop out of the movie Enemy of the State.
I hope the owner of the company doesn't read this. They probably like their designs! :)
I just went to Google maps to the address written on the van's passenger door and lo and behold, Google did drive down the alley behind and while this is a larger vehicle and not just a van, that's their look (they also have black versions if you look around): https://www.google.com/maps/@33.7851188,-118.211276,3a,67.3y...
I agree though that it seems more plausible to just be a real sewer van.