Quite a long thread about this exists over at rvforum.net The crux of it is the large park models and some of the larger 5th wheels do push up against the rules defining a manufactured home from an RV. The proposed rules, written by the RVIA, are to clarify the differences. RVs are vehicles, registered and licensed for road travel, manufactured housing is not. There was some language in the proposed rule that stated that RVs are not intended as full time housing, which they are not, but the full timers took that language and decided it means that HUD is going to sweep in and declare full timing illegal. Not so, but some people aren't convinced.
Freedom Elite 22FE
Ford E450 V10