What do you mean by "came loose"?
Did the bolts fall out or do you think there is some structural issue such as broken metal framing?
Can you post a picture?
Take pictures and measurements, and contact Heartland Service. There has been an "extended warranty" repair program at Heartland for units of this build period to re-enforce the pinbox overhang structural steel. Repairs are done at Heartland Service in Elkhart, and take about 1 week. Normally transportation of the unit is only provided by Heartland if the unit is within its original warranty year. I had this repair done in 2013, and spent $1400 with my Sacramento, Ca. independent RV repairer for "pre-repair" BEFORE towing the Bighorn the 2400 miles to Elkhart for full repair.
Search the forum for "pinbox frame flex" (use Advanced Search) for more posts on the subject.
I have a 2010BH that had frame flex, but nothing wrong with the kingpin---yes I did take it to IN and was treated VERY WELL---fixed me up in about a week and was on my way--no further issues.
al
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