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Good points!
@Cobb -The extra wheel will not really replace the braking capacity of 4 wheels...its just trying to recapture the remaining momentum of the vehicle when you are about to stop, probably starting a quarter mile before you need to stop, and not provide sudden stopping force.
@Backpacker3 - the assembly will definitely add weight but it should be just a smallish tank..some valves/electronics, piping, an arm, aluminum pneumatice actuator to bring the wheel up or down, an air compressor/motor and a wheel with chains connecting the wheel to the motor. Maybe total 50 lbs. The actuator will force the wheel down but there will be a stopper so the car is not raised from the ground, so I think the weight of the vehicle divided by the no. of wheels on ground is on the extra wheel which would help in the acceleration.
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