Greetings. New MH and put these on befor the first trip. My TST 507s are internal, mounted on metal bands that go around the circumference of the wheel. Batteries expected to last 6-7 years so, the life of the tires. Discount tire charged $15 a piece to install. We did the 6 wheels on the coach and the two on the tow dolly with screw on cap style on the toad wheels that are on the ground. They work great. The valve stems remain stock. Piece of mind.
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Gary
2017 SunSeeker 3010DS
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