[jeffba]

Originally Posted by ChuckS

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

In Our case
haven't done rough roads yet.
Bed and basement were not overloaded.
Gussets non-existent per TSB
weld that I have seen other have post would be a contributing factor