Jeff - Just received this photo. It was taken at a truck stop on I-80 in Wyoming, yesterday May 9, 2020.
Although not clear in the photo, the gentleman told me the stylized colored letters on the side and back read 'Mobile Medical'.
These medical trucks would be the right size to test or vaccinate one person at a time. There appear to be RV-type A/C units on the roof.
These modified pickup trucks must have been designed and built months ago, somewhere in the western US. They would support the talked about door-to-door forced entry, testing and vaccination of everyone.
Who knows just how big the fleet of these trucks is. There could be many thousands and, if so, it would have taken a year to build them in secret.