These photographs show the sort of deterioration that can remain partly hidden until the trailer is dismantled for inspection. Heavy corrosion can affect brake backplates, springs, mountings and running-gear hardware.
The important point is not simply that a component is rusty. It is whether corrosion has reduced strength, prevented correct movement or made reliable adjustment impossible.
Why inspection matters
A trailer can still roll into the workshop with serious defects. Regular servicing gives these problems a chance to be found under controlled conditions rather than after a failure on the road.
These images are genuine workshop photographs. The exact parts and repair approach vary by trailer, so this case study should not be treated as a fixed repair specification for another trailer.