What about Marathon's over the road air? Yes, mine has a smaller, OTR compressor living in the spot usually reserved for factory OTR air. Mine is called MACH, or Marathon air conditioning and heating system. It really does the job. I think OTR air is sized to cool a bus with 40, mouth breathing passengers. The marathon system is smaller, but cools the bus perfectly in all cabins. In fact, my wife's complaint is that it makes the bus too cold. (I keep telling her the controls are within reach in each room and all she has to do is turn the knob up or down, but she doesn't listen:-)

I thing the system work really well, and I miss it. Yes, the compressor went bad I think. So I am in the process of getting this fixed. I have calls into Marathon. Funny... here I am talking about how well this system works... yet it is currently broken :-)

I'll try to post a photo of it.

Best,

Adam