While overlanding, I find myself airing down less often that I initially thought. I never went below 1.3 bar (265/70 R17 tires), and this happened less than 10 times last year. Owning multiple rigs, old and new, I've sunk a lot of cash into fixed compressors - ARB single, dual, smittyblit, viair but I always felt it's a waste of money, at least for my needs.
I now use the European version of the Ring RCT-1000 (Osram TyreInflate 1000), it's very lightweight, portable and cheap. It inflates one 265/70 R17 tire from 1.5 to 2.4 in ~ 4 minutes and it's automatic. It also has a deflate push-valve built in.
I stop for coffee anyway when airing up, so a 20-minute break is not a big deal. With the dual ARB + tank, it would take ~ 5 minutes, single ~ 8-10 minutes, but I didn't really felt any difference or waste of time between Osram and ARB, because with the ARB or other fixed solutions you have to manually inflate/check/inflate/check/deflate/check.
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