Collapsed Rear Bump Stop Landing Pad & Frame Rail

In doing some electrical work recently I noticed what appeared to be some misalignment of the cab and bed/shell of my '06 DCSB (Passenger vs. Drivers sides) After checking the mounting of the shell, internal bed cage, and bed relative to the frame, I narrowed down the source to the passenger frame rail. I checked it from under the bolt-on AllPro sliders to the rear frame horn and identified a substantial ripple in the channel frame at the location of the factory bumpstop landing pad as well as a partial collapse of the bump pad itself.

My setup uses OME Dakars with AALs, OME Nitrochargers, a Wheeler's Flip Kit and Wheeler's Superbumps. I mentally walked back through everything I've done in the truck over the past 12 months and the only event of note was a quick departure off the 395 and up the shoulder embankment thanks to a patch of ice about 60 miles outside of Mono County. I know the truck bucked hard but it was definitely not as violent as even a moderate trip through the whoops. I haven't hauled any major bed loads and have only pulled a small utility trailer at maybe 1/3 of the 6500 towing capacity.

Has anyone experienced similar failure or had issues with a similar setup? Note: My frame, along with most '06 units qualified for the rust recall however I'm not aware of a west coast truck ever having been approved for the swap. I lived near the beach for several years so there is typical surface scaling but, even after a thorough inspection, I can't find any evidence of rot or rust degradation.

Any input would be appreciated.

 

Holy bump! Looks like just surface rust to me but took one hell of a hit to cause that. Gonna have to bring it to frame shop to bend it back and replace the bump stop piece. I don't think many will say they have hit a bump hard enough to do that, lucky something else didn't break!

 

Holy dog balls batman!!!! How the hell did you do that?