Generally that is solved with 15 lbs. In the lakester we have a 5 for the driver and a 10 that is split, a driver nozzle and engine nozzles. In the liner there are 3 fives, driver, engine, both.
Added note... Small compartments only need 1 nozzle in the drivers area... if you use one of the standard 3 nozzle ends you will have too much agent released too fast. Think about the air space in the vehicle when you are in there... that is the area that you want to fill. Both nozzles in the drivers area of little car have been modified to have a single slow release.