Out of curiosity, did you store the A-frame with the roof in the up position or down position when not in use? It is recommended, if possible, to keep the roof up. But have not seen any verified data how much it helps, or not.
Here is a video by GoingNoWhereFast showing spring replacement on an Aliner. I would think torsion bar replacement would be similar.
Aliner Aframe Roof Spring Replacement and Bungee Installation
Here is a thread on this forum regarding spring replacement for Aliner. Again, it might be similar concept for a Forest River torsion bar.
http://www.forestriverforums.com/for...ar-112916.html