Its only recently that some of the standard RV coach builders have started using metal framing within their walls, most of the RV's out there are still 2x2's and paneling or the FRP composite construction. The FRP walls are extremely rigid and resist racking end to end) but from what I have seen no one has figuring out how to anchor the individual components together. If proper strapping was used to tie the walls to the floor and to ea other at the ends it would make for a pretty strong box. How ever as soon as one end or a side comes loose the whole enchilada will fold sideways like a cardboard box with no ends. As it is when you see one of these vehicles in a wreck the walls are in one piece just no longer attached to the floor. A welded frame like Blizz's Rumrunner provides that 100% connection from wall to wall and to the floor. The biggest reason that the major manufactures do not all do it this way is time. When they can install the coaches cabinets and interior onto the floor first, and then bring in the walls already finished, many hours ($$$) are saved. working from the inside out allows for more manpower to be on the coach at one time, while a second crew assembles wall panels on a jig. I am sure that some type of anchors could be embedded into the wall panels to allow for a more secure connection, but again that would cost more money, and not more likely to happen until regulation dictates it.
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