I went with these -
https://www.trailheaddeflators.com/home.html
After trying the ARB several times, I decided I didn’t like stooping and baby sitting. At 69, I can still squat ass to grass, but who wants to tip over in the mud or snow? So I took a chance with these over the Stauns. I liked the idea that the adjuster is on the inside to prevent accidental adjustment. A small hex wrench for this is included. You can estimate a change in adjustment by the amount of rotation of the adjuster.
The owner was nice enough to calibrate them to my situation. Since conditions vary per trip and per moment, I had them initially set for 22 psi, accepting the fact that I could always lower them a little bit more manually with an air gauge with a bleed valve or readjust them lower more permanently as needed.
The only minor downside is that the design requires a certain minimum pressure to initiate the deflation. If you are already below that pressure they won’t work. This has not been a problem for me.
After a summer’s use I’m happy with them. With a partner, one can handle the caps while the other handles the deflators. While waiting, one can chat, prep, or see a man about a horse. And best of all, there is no stooping or babysitting. Takes about five or six minutes. They claim you can drive at low speeds while they are deflating.
Being American made and a small business, maybe Jim Everett, the owner, might be amenable to a group purchase now and then???