Oh geez that sounds terrible, sorry to hear that! Could it be anything to do with the front wall flexing? Rockwood/Flagstaff's are know to have that issue, It's happening with my 2018 HW27KS, it's where the wall that the bed bracing attaches to, is not built strong enough to to take the weight of the bed (thanks for that Forest River!!!!) Check inside where any cabinets meet the walls to see if you have any separation, this is the tell tale sign of the wall flexing. Some members here have added extra bracing to stop it getting any worse.
2018 Flagstaff HW27ks
2015 Jeep Grand Cherokee Overland