We have 2011 31.5 FBHS and towed it over 8000 miles from Kodiak, AK across the US and finally here to Colorado. Needless to say by the time we reached our destination it was creaking and groaning like an old wooden ship. I enlisted the help of a good friend and installed dexter's heavy duty "wet bolt kit" kit no. K71-358-00. The install was easier than expected, we planned the whole day and it only took 3 hours. The plastic bushings had all but disintegrated and came out in pieces. Make sure you install the bolts with the holes parallel to the ground, as indicated in the directions. Otherwise you'll have hard time injecting grease. Rustic Eagle has a great write up. All in all, no more squeaks and groans and the set up is incredibly beefy compared to what came with it. I'm a happy camper.
06 Dodge TCD SRW, Superglide 16K, 2011 31.5 FBHS.