One problem related to sway bar has been reported for the 2011 Ford F-550. The most recently reported issues are listed below.
Found rear sway bar hardware missing allowing for sway bar to come loose from the chassis frame. Research on other RV sites has indicated that this problem is not an isolated problem to my RV. Rv's are somewhat unstable but this problem is compounded by suspension parts coming loose. Many drivers of these RV's may not even be aware that they are loose. Some drivers didn't know until they saw their sway bar hanging down below the rear differential. Updated 12/04/lj.