JDUB and I both carry the Powertank to keep those tires topped off without having to deal with the compressor. A couple of the guys asked about it at POG IV and I've finally posted all info and pixs over at Prevoman Cool Bus Tools.

Top off by adding 10 lbs of air in 35 seconds.

pogtank_6845.jpg

http://www.prevoman.com/Pages/Cool%20Toos/ToolsPg1.html

Mike