She already figured out the issue with the springs. Faulty springs cuz of the removal of a critical leaf in the pack. Clayton acknowledged it and is changing their setup.
A stiffer leaf pack ,as I stated will resist it more ,but the root of the problem is the dropped rear leaf mount . I watched it happen when I installed same boxes on my XJ ...unless you think $800 3 month old Deavers are junk needing redesign ...Oh my friends XJ did same thing with his Alcans .