I apologize for bump an old topic from the dead, just have a few interesting observations from personal experience, maybe someone will need this information in the future.I had an ARB, and somehow misplaced it.
I've since had 2 sets of the Trailhead deflators
https://mechanicguides.com/best-tire-deflators/ , and am now back to the old trusty ARB.
The Trailheads refuse to deflate if your starting pressure is below 28psi, then they do not fully shut off, rather they just bleed air at a slower rate once down to pressure. You end up monitoring them anyways, and to be honest, the ARB is nearly as quick... it however works every time.
I can be wheeling at 1200' elevation one trip and 6000'+ the following trip, so, the automatic deflators do not appeal to me... if you have to watch them anyways, and finish up manually, why not just go the simple and trusted system.
I have found that when you have to monitor the automatic systems, then double check with a guage, and possibly finish the job manually, that the ARB ends up being faster. And, since I had lost confidence in the system, I was always double checking in the end.
Yes, I have to kneel at each wheel for a couple minutes, but, all of my wheeling partners are doing the same (they too have given up on the automatic systems, well, some have never bought into the automatic systems, and saved money while the rest of us went down that road), or they are unloading from a trailer... now that takes some time..I like to watch YouTube videos of a similar subject when I'm looking for information about the right product. I hope this helps someone in the future. Good luck!