Steve, I had a similar problem but a shade different. I went to the big ag tire store and they sold me a tube for a 5.50 x 16 tire that included a bushing where the stem goes through the rim hole. When I tried to air up the tires the bushing would come out every time I put air in. What I found out is that most sales people sell you a car tube with the smaller stem that is located exactly in the inside center of the tube, so when you start to put in the air it wants to pull back out of the side hole that ag rims have. I went back over to the tire store and explained my problem and the salesman said that was all that was available. That's when I said I wanted to talk to the guys in the back. When I described to him what was happening he said I had a car tube in an ag wheel. I told him I was told that ag tubes were not available according to the salesman. He said follow me and we went back to a room full of tubes and he pulled out a thick, offset large valve stem Firestone tube and asked how many I needed. I took 4 home and they work perfectly. So insist on an ag tube from a store that service and sell ag tires. The name of the store is Wertenberger Tire in Monroe, Indiana but they have affiliation with 200 stores in the midwest. P.S. They can even supply 12 x 28 bare unpainted rims so you can rerim the powershift wheels using the old attaching plates after removing from the old rims and welding to the new rims.
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