Posted on one of the QRP lists I receive, this really reminds me of the old milk wagon station used by the radio group in Dorchester, Ontario many years ago.
What is a HAMCOW?
The HAMCOW was developed as a mobile communications center that can be used for all sorts of radio events from ECOMMs, Road Races, Amateur Radio contests, Field Day, Public Safety, and Public Service events. It has been designed to sustain operations for days at a time and has been proving its worth on each and every trip.
For more information on this interesting project, here is a link.