[swill]

I carry two extinguishers.
One is a standard 2-1/2 lb. ABC type mounted on the roll bar behind me on the drivers side in a TEK208 mount for quick acquisition and deployment. I think it has about a 10 second duration of spray. Although a good unit I'm a little uncomfortable with the 10 second limit.
On the passenger side roll bar I carry an ELEMENT in two AXIA alloy all purpose mounts. This is not nearly as quick for deployment because of the process to get it started but it will spray for 100 seconds. It's also quite small.
I've never had to pull a fire extinguisher but with the combination of both I feel comfortable with the quick one and the long one.