Where are you located, I would be willing to guess that a Truck Stop with a Tire Service Center or a tire dealer who specializes in commercial tires would have what you need.
FWIW: I had a bad valve stem on my National Pacifica motor home. I called roadside assistance who sent out a commercial tire repair truck, to replace the stem it cost me $125.
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2018 Berkshire XL 40B
Past RVs: National Pacifica 40', Kenworth T300 Toterhome, Jayco Class C 32'. American Eagle 40',
American Eagle 40', Bounder 38' tag axle
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