How/Where Do You Inflate Your Tires?

We use our 25 year old CH work compressor when in town.

On our August 5000 mile trip we had to add some Yankee air once we hit the cooler temps of the northern hinterlands. The local truck stop worked fine.

Bobbo wrote:

X2. For around a hundred dollars you can't bear the versatility or speed

I know of some who use the onboard air in their DP's. Just need a hose long enough to reach all the tires, and spare if you have one. You could also use the onboard to fill an air tank, but it'll be lots of fillups if one of those big tires is low.
If you want a compressor that'll air your tires to 110, you need one rated to produce at least 150. At least that's what I see with our "100-PSI" compressor. Upping tire pressure from 70 to 80 on our Class C is all it can manage. Slow process.
I think you already have metal truck-style tire valves. If you don't and are using some kind of extender rig, changing to custom one-piece valves will drastically reduce the number of times you need to add air.
Or... A Truck Stop. Part of the reason I went with custom valves was so I could use any available air chuck. A lot of the Class C guys have workaround setups that work but take time. It's one thing to pull an RV into the truck service lane for 5 minutes. 30 minutes is another matter.