Recently had one go bad and my coach is only a year old. Commercial tire place recommended removing advising that extensions eventually all leak. Based on some posts here I would say that's an exaggeration but I ended up removing them just in case,and bought a dual foot air chuck and TST TPMS. This recent finding sold me on a TPMS for the very reason that I would have never known I had a slow leak on an extension while travelling. I agree, not easy to get to without the extensions, but with the long dual foot chuck I can make it work. And with the TPMS I use that to check psi instead of manually checking it.