I have been using the JT Brooks automatic tire deflators for the last couple years. Easy to set to your desired psi and easy to change if you want.
I have been pleased with the product.
Absolutely love my ARB deflator. Sure you're not doing all 4 at once, but it drains so fast that shouldn't matter, and it has an ANSI rated gauge on it that's bang on to my Snap-On gauge at work. Takes me less than 10 minutes to drain all 4 of my 31"s from 35psi to 20psi, and I know exactly what I drained them to because I'm using a gauge. Very easy to use and you can't lose the valve core.
^^^ Not sure you understand that the staun deflators do that for you. They are adjustable pressure release valves, you set them up for the pressure you want. You do not have to bother and waste your time as the deflators do the job. Besides deflating is easy, getting the tires inflated is always the PITA.