Oh yea...an ABC of similar size will do fine for your truck as well.
Since you asked and I'm bored, I'll get to the technical aspects of your question.
Fire extinguishers are rated by the amount of fire they can douse given the substance on fire. The ABC extinguisher is rated to knock down Class A, Class B, and Class C fires. It will not be effective on Class D or K fires.
A Class A fuel would be wood products or plastics that you would find in most items out there today. Class B fires are liquid fires such as burning alcohol or gasoline. Class C fires are energized equipment such as a toaster oven. Once the electricity is removed by blowing the fuse, unplugging, etc, it can be treated as a Class A fire. A Class D fire is a burning metal such as magnesium. A Class K fire is a new class based on cooking oils used in fast food restaurants.
Once a fire is ignited, it needs four things to continue: heat, fuel, O2, and a self sustaining chemical reaction. An ABC extinguisher would inhibit the chemical reaction from taking place, thereby putting out the fire. Keep in mind that the heat has not been taken away, so you must watch to make sure the fire does not reignite or ignite another nearby fuel source.