If it makes you feel better, there actually is a proposal by HUD regarding the revision of exemptions for RV's. If interested, here it is:
My takeaway is that it relates to Park Models. Some language that might make you happy: "HUD has not exercised regulatory oversight over Fifth Wheel Travel Trailers and considered them as falling within the regulatory exemption."
Now there is some language that references "primary residence" and "permanent occupancy" which might pose cause for concern down the road, but for now I think we're safe in focusing on sheltering in against the zombies and not HUD.
"Life is too short to take the same road twice"
Vaughan and Tracy, and our 4-legged fur babies: Zeus, Millie, Murphy and Miles, traveling happily in Tilda, our 2013 RW 36RL.