I've had great luck with SE Wigs . Great service. Wigs are super realistic and the hair holds up really well.

Man, you're totally right about that vibration mess. I watched my buddy's knees go from fine to shot over two years running a tower crane. What helped him was getting one of those thick anti-fatigue mats for the cab floor, it cuts down on the direct jolt. Stretching before and after the shift became non-negotious too, just simple stuff to keep the joints loose. It's one of those things nobody tells you about until you're already feeling it.