I really doubt that the cause is overtightening. Those bolts have shoulders that the flange nut hits so over torque would only stretch the threaded portion. It seems more likely to me that there is a design issue. Or rather an installation error at the factory. Maybe the hangers are too close together and don't allow enough flex room for the springs grow in length when they compress. Does either the spring maker or Dexter provide engineering info on mounting? If so it would be worth a look.
It also seems to me that the axles are being loaded beyond their rating. 8K each but an 18K trailer? Even a 16K trailer would be pushing it IMO.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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