The Kidde's are likely better than nothing, but a 10lb dry agent is probably the most appropriate for a truck. They have cheap plastic valves, brackets, etc. and are disposable. They also have less expensive chemical compounds that can be less effective and more corrosive.What is up with Kidde extinguishers, at the local Tarjet they have 5lb extinguishers but they do not have ratings only "locations" Garage, Electronics room, living area and they do not put the chemical composition on the box either. I guess I do not have the intelligence to understand so marketing is dumbing down for the consumers.
I am holding out till our building gets their next inspection and will talk to the local company about a rebuilt.
Anything less than a 5 pounder is likely to be inadequate and anything more than 10#'s impractical (unweildly)!
Halon is most effective in a closed, sealed environment (like an airplane cabin-but occupants MUST use qxygen masks). In the open, good luck "smoothering" a fire with Halon (it essentially "sucks" the oxygen out of the air and will kill you)!
Water will just make a fuel fire WORSE...