Pedro,
Thanks for the photos.
Get all four arms off and get em looked at, fixed and gussetted. The loads will still be there but hopefully once beefed it should last a goodly while.
Classic HAZ failure at from what I can figure is the maximum point of load for lateral forces (camber control). I presume the cracks are on one of the leading (front) arms? Essentially all trailer single trailing arm failures I have seen are similar to yours. Lateral forces are huge, especially when there is no left to right load transfer.
S
'95 130 dual cab fender (gone to a better universe)
'10 130 dual cab fender (getting to know it's neurons)
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