I've been using the Mckesh mirrors too, got about 4K miles on them. I stopped using them on my last trip because they started vibrating really bad in a fierce wind storm around Joshua Tree National Park last week. I found the straps made wear marks on the door body trim on both doors. The mirrors were installed the same as before, and I always wash the door first to make sure there's no residual dirt that might cause scratching. The mirror straps were vibrating and humming severely in the wind storm that may have been 40-50 mph.