Steel valve stems
Another thing to consider is the valve stem. I had two flats that were the result of faulty rubber valve stems. One actually failed while "parked" at Bryce Canyon NP for 3 months while I was hosting. According to Consumers Union (several years ago), millions of defective ones were shipped to the US. As far as I'm concerned, steel valves are the only way to go.
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Kemper
2008 2720SL - 7 cross-country trips so far + ventures into western Canada
2002 2720SL - 70,000+ miles before being retired to the farm
2015 Ford F150
"A good life is when you assume nothing, do more, need less, smile often, dream big, laugh a lot and realize how blessed you are for what you have." -- Author Unknown
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