I’m running the ARB dual hard mounted under the hood on a Slee mount. It airs up my 38s from 15 to 32PSI fast as hell. Faster than my single used to air up the 33s. Also runs both my lockers. Happy with it.
I'm the one who bought that compressor (400c)! It's working great and replaces my 400p, which is plenty fast enough for my relatively small tires. I'm happy to trade a little time to inspect the rig for the very lightweight and compact package.
I've got mine rigged tankless with a regulator on the output and a relatively low pressure switch so I can now just clamp it on the valve and walk around and inspect the vehicle, etc. until the compressor shuts off. I liked the 400p (portable), but the added steps of unpacking compressor, connecting/disconnecting the alligator clips to the battery, watching the fill-gauge to stop the motor, and re-stowing the now-hot compressor added just enough hassle that I found myself hesitating to air-down so that I wouldn't have to air back up. Eliminating a couple of minor hassles makes me much more likely to air down, which is better for both the rig and the family.
liked the 400p (portable), but the added steps of unpacking compressor, connecting/disconnecting the alligator clips to the battery, watching the fill-gauge to stop the motor, and re-stowing the now-hot compressor added just enough hassle that I found myself hesitating to air-down so that I wouldn't have to air back up.
After the run at the last Desert Rendezvous I do remember @Dave was helping his daughter while he was airing up. Meanwhile I was moving in between wheels. Everything else being equal. Dave's sequence of tasks were more efficient then mine. I did a mental walkthrough of what I do when airing up and I could see a gain. I didn't go with indeflate though. Someone was making their own 4 tire systems and it was as cheap as me buying the parts myself. Buying in bulk vs a one off I guess.
My first real job was working for the power company. We had procedures that we had to follow and sign off on. One of those procedures was a visual inspection before and after driving a company vehicle. I kind of still do that. Not when I go to the grocery store but definitely when I go on and come off a trail.
I like to do the visual inspection when I'm airing up/down. I'm already looking at the wheels. If I remember I also stick my head up underneath the vehicle and look for any debris or vegetation that might be caught up in the frame. Especially around the exhaust system. I definitely see an advantage of not having the visual inspection interrupted by moving between wheels.