As you probably know, pneumatic tools (impact driver or air rachet) need two things to work well: air pressure and air flow-rate.
Our rigs have the 100-or-so pounds of pressure needed for such tools, but typically cannot sustain the flow rate (quantity) of air needed by the tool. Short bursts possibly. There's nothing like removing 3 lug nuts from a wheel....and then waiting 90 seconds for the rig's air to re-charge so you can remove the other two lug nuts.
Robi & Dale ---- Go Navy ----
2016 Winnie TOUR 42'
Tow: '08 Buick Lucerne