I asked the drivers, fresh out of college, but they only knew that it was a GM and that Penske seviced it. It looks like it's a GM Vortec, but I couldnt' find the exact specs. This particular "Wienermobile" was 4 years old with 260k miles! Based in Milwuakee.... of course.
It was parked poorly for lighting =( Glare ftl: