I also have them in various compartments in the basement so they are handy for dealing with an errant water heater, etc.
I lost my previous coach to a fire while running on the interstate because I did not have enough fire extinguishers to keep a wheel fire from flaring back up.
I am considering a few large cold fire units to add to my collection.
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Neil V
2001 Winnebago Adventurer WFG35U
I put 2 extra ones in. One in cabinet next to kitchen. I put a label maker label on the cabinet so everyone could find it quickly. The other one I put in the bedroom in case we had to fight fire on the way out. I hope to never need either one.
I suggest that at least one of your extinguishers be the larger 5 lb size as compared to the typical handheld (2.5# or smaller).
Costco currently has a good deal on the 5 lb First Alert Heavy Duty fire extinguisher. It's store-only so the price isn't listed online. I don't remember what I paid but I'm guessing $30something.