At the Fall Rally, Mac the fire Guy was there to give a demonstration on fire suppression systems and fire extinguishers. Speaking as a 35 year member of our volunteer department, it was awesome.
Fire Fight makes a product that addresses the RV refrigerator fire problem. I bought one for my Montana. Here is the picture of the piece:
It mounts in the outside refrigerator compartment. It can be removed and re-installed in another rig. Here is the link to the system.
http://www.firefight1.com/upload/prod1.php?pk=5#qvc
Also, Mac demonstrated the use of foam extinguishers. VERY IMPRESSIVE. Needless to say, I retrofitted my two 2.5 gallon pressure water extinguishers to foam. I bought the foam at the rally and the aerator nozzles for each from my local extinguisher dealer.
I carry these (one each side) in the front side compartment along with other smaller extinguishers.
I don't buy the phrase "It can't happen to me."