I carry three in the 4wd at all times. Two 1k dry powers, one in each of the driver & passenger door pockets, and a 2k Co2 in the rear. I also take a 9k water extinguisher mounted to my spare wheel, if I'm going anywhere that I'm likely to get dry grass caught up under the truck. The water extinguisher is great as it can be re-filled anywhere if used. Fill 3/4 with water and add 1/4 cup of dish washing detergent, then pressurize with air to 80psi. Good for putting bush or grass fires out, or to wash your hands.