It is easy for corrosion to develop at the joint where the perch is welded on to the frame without being visible. It seems that corrosion can develop underneath the rubber coating and make it diffucult to discover unless the area is carefully inspected. I have seen one fail firsthand, it is a big problem and can easily kill someone.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record