Several years ago, I installed the braided tube-type extenders and can verify that they were a continual source of leakage before I finally removed them. I just recently had a similar discussion with my tire guy regarding extenders for our current motorhome. He did not recommend them, but instead recommended gator caps. These allow you to check the tire pressure and adjust the pressure without having to remove caps. He said they were very popular with commercial truckers. I accepted his advice and had six gator caps installed. They replaced the existing valve stem caps and only cost about $1,50 each. Unfortunately, I cannot yet verify how well they work.
