I installed the dual ARB compressor in the engine bay. My everyday carry is a small tool bag with a single ARB hose, a collection of tips (for things other than tires) and a digital gauge for inflating (or you can hold when on the valve stem to deflate).
I also added a handheld end to by everyday carry bag for use to blow dust off/out of things and keep that in that same bag. This was an add after one my group rides down very dusty trails....and EVERYTHING was covered with dust when we were done.
For airing down, I have used the Staun tire deflators. Great quality - but a bit of a pain to get dialed into anything other than the default PSI they are set to. As a supplement, I just picked up, but haven't used yet, the tire deflators from Over-Sand (I liked that they have readings to know what PSI they are set at).
For airing up, I have the Morrflat 4-hose kit - shorter length option. I have the stubby manifold (not the newer version that you can set the PSI with). I find it's pretty easy to connect everything, turn on the compressor and then just slide and hold the manifold to let the system level out and get a PSI reading - if it needs more air, I close the manifold and let it keep running, otherwise I close the manifold and turn off the compressor, disconnect, release the pressure in the system, and put away. I picked up some extra velcro ties to help keep the tangle of hoses organized.