I bought one of those AMF metal fire trucks several years ago. I had a fascination with a conversion done to a Crown fire truck by putting a fifth wheel on it, which allowed it to tow a water tank to remote locations. I figured maybe I could use a Tamiya tractor and their fuel tanker. Still on my list of things to eventually do, though.
http://www.crownfirecoach.org/Featured_2004-01.html