It's actually a fairly common and well known scheme. I've seen stuff in trainings that show full on replicas of cable company vans, complete with ladders on top, utility company trucks, corporate transport trucks, etc. It is very creative indeed! One that was a bad one and would be suspicious to a keen eye was a van disguised as a "Comcast" or "Time Warner Cable" company van but had a "Dish Net" logo on it too.
This UPS one is pretty good though, even using a cloned plate that would come back to a UPS registered truck.