This will not affect RVs or their safety or the liability of manufacturers. This 'change' is to note the difference between mobile homes and motorhomes, brought about because newer 5th wheels and park models are now rivaling the size of mobile homes. If the newer 5th wheels and park models fell into the class of 'mobile homes,' they would become much more expensive as they would have to comply with residential building codes rather than vehicle codes. Because the previous exemptions were based on size, and the current crop of 5th wheels and park models have grown so large (square foot-wise), HUD needed to do away with the size exemption and use something else; they chose the fact that they are supposed to be part time vehicles rather than full time homes.
So, now a new RV will have a temporary sticker attached. Nothing else changes. Another non-issue...