The vehicle is experiencing severe frame flex causing the 2 passenger side entry doors to open while traveling down the highway in addition to rubbing the interior cabinetry against the side walls of the interior and causing the furnishings to be damaged. When the doors are wide open items can easily fly out of the vehicle while traveling making my personal items projectile hazards. The vehicle has been diagnosed for frame issues by an authorized repair facility ‘Busted Knuckle RV’ in Las Vegas Nevada. Grand Designs did not authorize the repair facility to perform the necessary inspection work and Informed the shop that I would be liable for the cost of the initial tear down inspection that can average $5,000.00 The unit has had saw dust and rub marks on the interior since we first purchased the unit and transported it from Texas to our home in Arizona. We were not sure what caused this rubbing of the furniture on the interior and were later informed that this is caused by extreme frame flex or failure. The pinch style moldings that cover the seams on the front cap of the rv have loosened while driving and flap in the wind while traveling down the highway, I have since been forced to apply silicone to keep these in place. This style of molding is designed to stay in place without having to apply any adhesive to them. The doors have opened while on the highway on several occasions causing great concern considering we only use the vehicle approximately 6 trips per year.