Seasonal camping in the Northern states

I don't understand why you can't live in a TT in the winter in a campground but you can in a mobile home, they are pretty much the same thing, it's just a really long trailer. They both have plumbing above ground, i don't see how those are ok but Rv/TT's aren't.

I am going to just look into living in a trailer park now, in a regular mobile home. If I can't live in an RV full time up here then what's the point.