Sorry, I didn't mean for you to check, I meant the OP.
Unfortunately, RVs are not subject to the same safety standards as automobiles are. That's why class Bs are more expensive - because the entire vehicle is built to automobile safety standards, not just the cab area.
As far as I have been able to find, RV manufacturers do not have to build the house portion of class C, class A, TCs or trailers to any federal or state safety standard. The only "building code" is developed by the RVIA and is only required by its members. And those standards don't address crash safety.
