The US Federal Reserve document
that Klem is likely referring to (judging from the recent FiberglassRV discussion, for which I can't find the link) is about funding for housing. In this document, the Recreational Vehicle Dealers Association (RVDA) explains their argument that RVs are not really "housing", and thus should not be subject to the financial rules for housing (specifically escrow accounts). The same logic could be used to excuse RVs from other types of regulations for housing... however, electrical and gasfitting codes are about safety, not the availability of housing.
Of course, the US Federal Reserve has no authority over any safety requirement, nor over anything at all in Canada. I don't think this is about the authority of the US Federal Reserve; it is about RVDA's argument for exemption from any housing regulation.