One more idea.
Years ago I bought quiet compressor to inflate conversion suspension without starting the "rocket" Detroit.
The noise is comparable to Honda generators, but the speed of pumping is annoying.
Regardless, I no longer have air suspension, but like to use that oil-less compressor for tire inflation as drops of oil inside my tires don't bring my applause.
I keep it at full pressure in the garage, what for car gives me enough air to top 4 wheels, so I just carry it around without plugging in and with its light weight it is very convenient.
Good part about it is pretty precise regulator, so for truck tires I set the regulator and with self-holding chuck I just set in on big tire and go to other work.
My new Ford come with build-in 400W inverter and the compressor runs out of it just fine, so it will from most of the inverters owners have in their RV.
The model I have changed and here is
its younger brother. 
