Wheel valve extension
I bought the proper tools to check the pressure and fill them. Same one used on lots of trucks.
That and making sure the wheels are mounted on the axle correctly so I can actually check the inside wheel. That means the inside and outside stems must be 180 degrees apart. Eg opposite sides so I can reach through the outside wheel to reach the inside stem.
I tried extenders, both solid and flexible. Threw them away.
2012 Dodge C3500 DRW 4x4
2012 Keystone Montana 3100RL