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I too have 2 120-volt air compressors. the Aux unit doesn't always start, I think it is a bad capacitor. I have a spare and will debug that asap. I spent 4 months south and didn't want to rely on the one Thomas unit so I bought one at harbor freight. 2 Gallon 135 PSI Ultra Quiet Hand Carry Jobsite Air Compressor. it was under $200. it has more capacity than the Thomas unit and is quieter. It looks like the pump could replace the Thomas unit if I take the compressor off the tank. I have used this for 3 month and like it. I talked to Newell and they told me to hook it to the lower rear air hose connector in the engine bay. I use an air drier before the coach to ensure good air. I regulated the air pressure to 120 on the harbor freight unit.