Very expendable. Mine were ripped off during a challenging parking experience in a very small CG when i found one of those little round wooden tree trunk like object that they like to install all over the park. That was in 2006, i never bothered to replace them. Honestly i've never missed them and none of my 3 RVs since have looked the worse for wear. Granted I am in So Cal where we have some pretty darn clean roads. May have a different opinion/experience if the majority of my travel was in Alaska or the like. Side note, I believe there may be a law on the books requiring them but no fix-it ticket yet so maybe not.
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