I use Staun in the Jeep because you can install them and continue down the trail till they turn off.
I have also used these:
Terraflex Deflator as an economical alternative. Install the first one and wait 30 seconds, then install the next, and repeat.....you can then go back to the first tire and monitor pressure with your gauge. This 30 seconds will give you enough time to work your way back around to each tire for removal after your first tire reaches target pressure.