What is your main use? I have found the ARB twin to be one of the best 12v vehicle mount around. It can be portable and with an air tank run an impact for small bursts. But with the new cordless tools there is no reason to need air for that anymore. I have a few power tanks and for Jeeping found this to be my favorite as it can help you seat a bead on large tires. 35” with no starting fluid. 40’s you need starting fluid and some luck. Great to blow the dust off with. It would easily last a weekend in Moab airing up and down, quite and convenient . I also have a large Powertank in my RV for fast instant air. Down side is you need to fill them and they need to be upright or angles up when using them. I have the quick shot Powertank with a regulator (paintball tank size) on my SxS. Roll bar mounted and it can seat a bead on my sand tires and 34” dirt tires with starting fluid. Take my 34” tires from completely flat to full two times. Perfect for emergency travel. I keep a Milwaukee cordless M12 in my Expy for travel. Great little compressor for topping something off. And last but not least a Rule high speed inflator for water toys. It’s expensive but worth every penny.
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Well, I have gone through numerous "cheap" portable air compressors over the past few years. Most seem like they last a year or so. I have the privilege of being able to work from anywhere and my wife works in the schools, so summer time is camping time. Our oldest son stays at home to work and keeps care of the house, while the wife, our other son, and I travel around camping. Since I check tire pressure before every drive and I have a bike with a slow leak tire (too lazy to just fix or replace the inner tube), I am almost using it daily.
I have a nice DeWalt one right now that seems to be better quality than the off-brand $20-30 ones off Amazon. I think this one was just under $200 because it included an extra battery (which works perfectly with my other DeWalt cordless tools).
I just thought something on board would be nice since the Expedition doesn't have the same rear storage that my Pilot had and I am looking for a good spot to store it. As an option, a permanent one was being considered. The one that I was looking at at previously (since I wanted the F-250 and the wife said absolutely not) was a Viair system. I have not looked under the Expedition to see if there are any good places to mount it.
Anyway, enough babbling.