I just looked at the fire suppression systems at
http://www.blrmotorsports.com/safety.htm
Quick question, I couldn't find the answer on their website.  Are such
systems self activating, or must the driver throw a switch/push a button?

The reason I ask is that in our case, in the Vanagons. one of the
problems seems to be not being aware of the fire until it is to late.  A
self activating system would be great.