I just replaced two sets of wheel bearings after 10,000 miles on my Keystone Alpine, 2012. I had about 6000 miles on it before my last trip and while preparing for that trip I checked all wheels. I ...
My take on this is the small amount of play was correct. You over tightened them and caused the failure. Tighten them while turning then back off till cotter pin fits. On this size axle that usually ends up with a little play. Tighter than that is to tight. 40 yrs master mechanic