It's true, motorhomes fall into the "gray" area when it comes to government regulations pertaining to safety and crash testing. However, Winnebago Ind does perform a "drop test" occassionally on newly engineered models. For the most part, they rely on computer structural analysis, test track, and test simulator which can simulate a 10 year life cycle, but over the years have taken new designs and performed a drop test to verify computer analysis. They take one of the first production units and remove the roof acs, rack and ladder, roll it over using a large crane and huge foam blocks until it's upside down, then they raise it 3 feet in the air and drop it on it's head. I worked at Winnebago Ind for 15 years and as Marketing Manager we videotaped the procedure several times and used it in advertising. The criteria was: no appliances or cabinetry could become dislodged, escape windows must operate, and there could not be more than a 2" deflection in the sidewall. They passed! Most manufacturers take their prototypes to OHIO to TRC for road testing on a simulated track that has bumps, rocks, sine waves that twist the chassis, and chatter bumps.