I used to have an an ABC fire extinguisher in the trunk because it's cheap. But then I changed my mind about it. Here's why:

1. Fire extinguisher powder is corrosive and generally awful for the electronics in the car. You spray it on the engine and you might as well junk the car -- or so I've been told.

2. The trunk fire extinguisher is really for other people's fire. I'm willing to change my mind, though, but it seems to me that if your car is on fire because you've been in an accident, you may not be able to get to the trunk in time.

So now I'm thinking of mounting a halotron extinguisher inside the cab. (Halotron is not corrosive, and can be used on electronics.) The problem is that can be expensive. Halotron is not cheap to start with ($100-$140 for 1.4 or 2.5 lbs, depending on the brand). Mounting securely inside the cab can be a challenge.

I'm trying H3R's universal mount, but it's not that universal! You are supposed to be able to attach it to the seat sliders, but I think I'll need smaller nuts and bolts. That is not optimal because I don't want to use hardware that is smaller than the holes they need to go through.