Basically every make and model fifth wheel for the last several decades has experienced issues with cracking sidewalls and usually around front slide out lower corners...
Many owners don’t have any issues and some unlucky folks are having issues..
Key contributors ... my opinion.. are
.. rough roads driven over
.. over loaded basement and storage areas forward of front axle
.. lousy welds on frame to wall brace structure
.. inadequate cross beam and gusset supports
YMMV
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