What portable compressor?

This is what I use for my 33s. https://www.amazon.com/dp/B005ASY23I/?tag=wranglerorg-20 Its done great over the past 4 years. I'd like it better if the air gauge was a bit more accurate, or if it had a better connection point. this one you have to screw onto the valve stem, so you have to unscrew it every time you want to check the air pressure.
 
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^^ X2

I bought a Viair 400p a few years ago and it has worked well. It has the regular chuck (not screw-on).
 
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X4 Viair 400P.
If you don’t always have passengers in the rear seat, store it in one of the foot wells behind the front seats.
Transfer the compressor to an ammo can that has a padlock eye added. Cable this box to the front seat frame with another lock that’s keyed to match.
 
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I use a little viair 88P, it's rated for 33s and connects to the battery. Just keep it in a 5 dollar harbor freight tool bag and throw it in the jeep when we head out. It's slower but the hose is long enough to reach all 4 tires and airs up my tires when needed.

Viair 00088 88P Portable Air Compressor https://www.amazon.com/dp/B005ASY23I/?tag=wranglerorg-20

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Just thought that I would add to this discussion since I just bought a Viair compressor. I considered an on-board air option, but I really liked the ability to take the Viair with me in any vehicle. Having it on road trips will be a great option.

I originally bought the 400P like Chris has. I got it home and tested it out, and after one fill up I realized that it wasn't the right model for me. I quickly found that the compressor never shuts off, so the only way to get a pressure reading is to remove the clamp from the valve stem and use another pressure gauge or walk back to the compressor, shut it off, back to the tire to get a reading, back to the compressor to turn it back on, then back to the tire. I'm very lazy, and I just knew that I would eventually get frustrated by either of those two options so I returned it.

A call to Viair solved the issue, as they recommended the 400P-Automatic. That unit shuts off once it reaches 145psi, and uses a standard style inflation gun. It was only $20 more and still provides the same 2.3CFM.

https://www.amazon.com/dp/B000X9B32M/?tag=wranglerorg-20

https://wranglertjforum.com/threads/small-compact-air-compressor.387/#post-23790