The Kingpin ripped away from the pinbox on our 5th wheel. We were told by some that it appears to be inferior material and/or poor weld. Our truck almost flipped down the hill where our rv landed. Others could have been injured or killed had the RV gone a different direction. I have contacted the RV manufacturer and currently awaiting a response. No warnings. Police and tow drivers said they have never seen this in over 50 years of service. Photos available.