Boz
Observer
I don't know about Carli or thuren. Pretty much the best way to help prevent this issue is TIG weld the axle tubes to the castings and truss it, however, no one sells the truss by itself. The stock radius arms with rubber bushings are more forgiving than the aftermarket radius arms that utilize solid 1.25" rod ends.
Not sure exactly what you're looking for but Thuren sells a truss kit.




