Without knwoing what lock you have.. Hard to help.. but here is what I found.
My RV has Tri-mark latches.. Tri-mark, on teh striker bolts (Dead bolt too) uses a fairly cheap Base Metal that is not all that good at torsional loads (Bending in this case) in fact it tends to Toothpick when bent (Bend a toothpick in the middle and see what happens).
And of course the design puts the most stress,,,, on the weakest point.
Two fixes.
1: Have a fabricator carve you one out of STEEL.. this will outlast the original by many years.
2: On some of my basement latches... when they break I machine them down a bit (Basically gouge a slot in them) and lay a steel "Mending bar" (Flat piece of metal about half an inch wide (or less) by around 2" long with two holes) and use screws to attach that to the broken pieces.. It too is many times stronger than the original metal.
