Interesting theory. I do understand, that CO could enter in through the intake into your compressor tank, as you describe. And when blowing out the lines, could go from compressor tank and out the faucets into the RV. If the CO did enter in to your compressor tank it would be....well....COMPRESSED. And as such might be quite CONCENTRATED. So blowing a little through the lines might actually be blowing a high concentration through the lines. The thing that impresses me is that you could figure that out. I never would have thought that through. Good job.
But because of the high concentration coming in to your trailer, I would not think your CO detector is OVERLY sensitive. Probably working just fine. And good thing it is too. So I would not worry about the CO detector.
