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I generally deflate the bags entirely before unhitching and hitching. I then run around 3 to 5 psi in them when not towing. I think they recommend at least 5 psi. The one time I forgot to deflate before unhitching I noticed psi was at 45 after unhitching. When hitched it is at 70 psi. Our Montana has a pinweight of 3300 so requires pretty good pressure.
The onboard compressor is not required nor even necessary but it is very quick and easy to inflate and deflate. And I consider the ability to adjust to road conditions on the fly to be invaluable. But that's just my opinion. We had the Firestones on another truck a few years ago with the compressor so when we got them for this truck I insisted on the compressor. This is naturally just a personal preference. You can do just fine without the compressor if you want.
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