I have hit the floorboards a couple times going around sharp corners. Especially if the pavement is not level or there is a big dip between two roads. That doesn't bother me to bad.
I think I may have damaged mine putting her on a trailer one day. The angle from the ramp to the trailer deck was to acute and she hung. Sort of like a rice-burner going over a speed bump.
I actually just stopped by the local bike shop and picked up two new fittings at lunch. Since these are only pivot points and not high revolution shafts, I am not to concerned. As long as a little grease is in there, it should be fine. There isn't a lot of heat or pressure pushing the grease out. The worst thing is that your ass end might start squeaking when you go over bumps.
'07 VN900 Classic
Horsepower is an illusion.
Torque is the source of all good things.