We carry a pancake compressor as others have mentioned. Use shore power or gen when needed. Get an extra length of coiled airline to reach far side wheels.
I recommend having solid dually stem extenders to help with access. My tire store does a lot of truck and RV work and had them in stock.
This is the fill tool I use. The valve connection locks on stem. I added the T and extra pressure gauge so I know the supply line pressure. All available at WM.
The tire store ground the wheel cover to improve access to the inside stem. I still need to cleanup the edge to remove some burrs. I need to do the same on front covers.