Leaned a neat trick from a old friend, it take a little extra planning, when applying app tape, you put down large pieces of app tape and leave about a 2" wide strip bare in the rough location of the vertical line of rivets/screws, then put a separate piece of app tape about 4" wide down the rivet/screw area, it over laps both the left and right pieces of app tape so it can be removed later.
Now, you place you cut graphics into position on the box truck, and align the rivet/screw app tape section with the actual rivets/screws on the box truck. When applying pressure to the flat areas of the main graphics on the flat surface, you leave the line of rivets just tented over the actual rivet/screw row (vertical), apply pressure to everything except the vertical rivet/screw area, now peel the 4" wide vertical strip from the row of rivets/screws, pulling down against it's self.
Then after the 4" wide piece of app tape is off the column of rivets/screws, which are slightly tented over the rivets/screws, you heat the area with the rivets slightly and use the Rollie Pro to conform the vinyl to the rivets/screws and roll out any air that would be trapped. Heat is important in these applications because it softens the vinyl, letting it conform to the irregular shapes of the rivet/screw heads.
I know some installers tear away a section of the app tape, bu I feel this method is better for me.
Works Great!
Here is a link to a tip from 3M for using a punch to cut the vinyl around the rivet head.
http://www.youtube.com/watch?v=iq8ylkM6zjY