We have extensive frame failure on the front cap of our RV. We are unsure of anything rear of the RV. We had broken welds, missing bolts, and flex while towing. It was inspected by the manufacturer and was outside of their frame flex limits and was deemed unsafe to drive until repaired. We have had it fixed and an ibeam installed as well as welds fixed and other beams installed on the side for support. Grand design has been involved all reports and did come for inspection at the service facility. Warning signs prior to failure: movement of interior furniture against wall, doors coming open enroute, doors not closing correctly, trim coming off enroute, screws coming loose, floor of front of camper creaking.