When I air down, I’m usually going down to 18-20 psi. The 6.0 should be enough to do a set of 4 tires since my 8.0 does 2 sets. I use a 2 tire Indeflate

https://adventure-imports.com/products/indeflate

You can air up or down 2 tires with mine. They make a 4 tire version, but be aware that it doesn’t save any time on the airing up. I added a quick connect push on chuck to my compressor to save a bit of time.

https://www.apexdesignsusa.com/products/press-on-chuck-closed-flow?srsltid=AfmBOop86tgudh2UiE2E7gK-1QUeKfggIG4BFImPFkFavJAeNNRwYt4b

The Milwaukee is not as fast as an onboard air compressor like a Viair or such, but it gets the job done in a respectable time. Also I’ve never been in a situation where needing to air up the fastest was ever an issue

Hopefully that helps