35 years ago, Winnebago had an ad where they suspended a 26 foot Class A upside down from a crane with straps about 3 or 4 feet off the ground and then released it. It dropped and stayed intact. BUT, if you ROLLED the unit(which would be the case 100 percent of the time), the motorhome disintegrated just like all others. I do not believe there is any Federal guidelines on roll over or cage protection on RV motorhomes. They DO have laws that affect the Drivers and Passenger seats and the restraint system must meet federal standards. ALL the pics I have seen from BAD accidents and the Motorhomes rolled over on their sides or completely rolled over, they where just a pile of wood and fiberglass. Doug
PS, if they did have a standard, I doubt you could afford the motorhome and probably 75 percent of motorhomes owners also.