I've had valve extenders on every RV we've owned with (knock on wood) no problems with them. However, I did discover that when I thought I was having problems with the extenders it turned out to be the air chuck.
Sometimes the metal piece in the center of the chuck (which floats inside the chuck) will end up off center and won't allow me to fill the tire with air. The chuck goes over the valve correctly and doesn't let air escape, but it won't let air in either.
It seems unlikely, but I've had the issue with both chucks (truck style heavy duty dual fill type) that I have used past and present.
I've also seen bent valve stems, but those were more obvious. I don't know what caused me to ever look inside the chuck. But glad I did.
Jim
02 Ultimate Advantage 40J no toad (between toads at the moment)
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Jim
2019 Coachmen Mirada Select 37LS
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