We had the same problem. We added about a 6 inch long flexible valve stem extender to the inner tire and wire tied it to the valve stem on the outer tire. It works very good although on the inner wheel I need three hands so I hold the flexible stem of the inner wheel and the air compressor tip together and my wife squeezes the air compressor trigger. To place the valve stem extender on the inner wheel I took the truck to a tire shop, asked them to balance all 6 tires and while they had the inner wheel off the truck attach the extender. When I got home I added the wire tie.
