wolfe10 wrote:
Sure, next time you break down the tires, get a more user-friendly valve stem.
But, in the mean time:
In most cases, you can move the coach so the inner valve stem is at the 3:00 or 9:00 position and lying on the ground, reach in and install the sensor.
No, it isn't fun, but not something you need to do very often. And, IMO, better than adding an extension that gives you another place for a leak to occur.
When all else fails solicit the help of a double jointed small person to slid their hand in between the tires and screw that sensor on for you.