Clarke, if you use the system to inflate your tires AND your tires are inflated to over about 110 psi you will find that it is a pain to use. The engine mounted compressor will take the system pressure up to about 120-125 psi and shut off. However, it will not kick back in until the pressure drops to about 110 psi. That makes it very difficult to fill the front tires on most Newells that need 120+ psi or even the drive axle which may require 110+ psi.
The pressure multiplier takes the air from your coach system and increases the pressure by approximately 50% so if your engine air compressor kicks in at 110 psi, the pressure available to inflate the tires is, at a minimum, 165 psi. That will easily inflate any of the tires on a Newell.
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