The only part of your inquiry that I can speak to is the direction of the valve stem. All six of your tires are mounted on the same rim. On the fronts and inner rears the valve stems all point out. The outer duals point in because the rim is reversed. A dual headed tire pressure gauge can be used to check the pressures. Sure, it has a learning curve, but once you figure it out it is simple to use. Good luck.
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Lt Keefer
2018 Hurricane 29M
CHF, Saf-T-Plus, SumoSprings
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