If yours is a recent model 2013 or later, it should have the plastic FlexAir extenders. You can check pressure through the extenders same as through the valve stem. If you don't have extenders, its a crawl under the coach ordeal to get to the inner stem, and you may want to consider adding extenders. Lots of theads about tire pressure, valve stems and extenders, etc. You may want to search through the forums about this. Most believe you're better off replacing the original valve stems with high pressure metal stems. adding extenders to rubber stems will result in a lot of torqueing of the rubber as the wheel rotates, and they'll fail quickly. Also, consider a tire pressure monitor system to alert you when a tire starts losing pressure.
I use a combination gauge/filler nozzle to fill my tires - lets you check pressure as you fill the tire with air - saves having to switch back and forth between a pressure gauge and a filler nozzle.
Ed (N4RWU) & Becky Taylor
Mistie (Walks 4-down)