One of the most common causes for shackle straps to break is over-tightening of the shackle bolts. If the shackle bolts are too tight, the shackle straps are not able to move with the suspension. This causes binding and it can bend or even brake the shackle straps, bolts and hangers.
The sliding that you are experiencing on the rear axle is common for tandem and triple axle trailers and it is usually called scrubbing. The rear axle scrubs because trailer axles are not steering axles,... view full answer...
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