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So………….

The idea is to prevent the low frequency vibration from the pump from transmitting to the frame of the coach. Let’s talk about the concepts. The pump is mounted to the floor of the gen blower bay, correct. The pump frequency is resonating in a harmonic with that bay floor.

You are going to have to experiment with different isolators to find what works with the weight of the pump, the vibration frequency, and the bay floor.

Keep these ideas in mind when playing around. The pump should be mounted on an isolation plate. The isolation plate should be mounted to the bay floor. Use isolators that with bolts that do not contact the pump, plate, or floor. You might think of something like this https://www.mcmaster.com/products/isolat...h-studs-6/ or like this https://www.mcmaster.com/products/isolat...ushings-6/

Now here is the key part. The plate material and thickness is really important. You may have to try different thickness steel plate to get the result you want. The idea is that the plate decouples the vibration of the pump. In different words. Some vibration will transmit from the pump to the plate, if the plate is the correct thickness and weight it will not vibrate at a harmonic frequency with the pump thus negating much of the vibration of the pump from transferring through the next isolators to the bay floor. I cannot tell you which isolator will work best, and I cannot tell you what the thickness of the plate should be. That is some specialized engineering. So you have to experiment.

Or buy a JunAir oil based compressor. You will faint at the price, but you will never know it’s on.

Right now I'm setup with piece of plywood that has rubber on the bottom and is stuck to the floor with silicone.  In between that board and the compressor is some rubber bushings.   From the sounds of what you're saying I should have a piece of steel of a yet to be determined thickness mounted to the floor with rubber bushings in between it and the compressor?  If that's the case how would one best go about attaching the bushings to the plate, would I need to tap and die and then screw the bushing into it that way?

And I'll bite on the JunAir proposition...can someone shoot me an appropriate model that would work for this purpose.  A silent compressor would be pretty stellar.  On a related note I'm moving into a larger stall this winter and my biggest task is once temps get cold to really go over this thing to get my times back up to where they should be.  I'm at about 1.5 hours in full summer heat, so we've got a couple leaks to track down somewhere other than where I've already checked.