Originally Posted by follow-the-road
Yes, everything has been checked out by our dealership and they can find nothing wrong. We believe they were installed not perpindicular to the frame so as the mechanism turns, it puts too much pressure on it. Grade 8 bolts are extemely strong bolts, much better than those orinally used and it is amazing that the mechanism can break these bolts at all.
Grade 8 bolts are stronger but yet much more brittle so in turn when using them as a shear bolt they may break easier.
whereas a softer bolt gives more possibly lasting longer.
factory most likely used Chinese grade two try a quality grade 5 such as rockford or lawson.