Top idea Bazza, works well for me too.
Roughly 20L ute chassis mounted tank to 150psi off an ARB twin.
Great for quick tyre inflate blasts 0< >40psi (30-60 secs 'guesstimate' on a 33" 60+ on 35")
By the time you've moved to next tyre, tank is back to 150psi blast ready again.