X2 on the Smittybilt. It's a decent compressor and I have it permanently mounted under my rear bench seat and hard-wired to my house battery.
I also have an ARB single air mounted under the passenger seat hard-wired to my starter battery. This gives me redundancy and speed when re-inflating. I always air down if I know I'll be off pavement for a while. Having a good compressor set up will make it less painful to air back up, so you will air down more often.
Airing down is highly recommended when off pavement not only to smooth out washboard and rough road, but it also makes your tires less prone to damage/getting a flat if you air down properly. Airing down gives you increased traction, and if you are in sand, it is absolutely necessary.
You should research how much to air down in different circumstances. The tires you have, the conditions you are driving in and the speed you are driving are all important factors. Not airing down enough will provide little benefit, but airing down too much can be dangerous depending on conditions and your speed.
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2001 E-350 V10 EB50 Penthouse
4.56 gears w/ARB Rear Locker
4X4 Quigley
Agile RIP
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