What is a mobile home called in America?

The accurate name is a Mobile home, or a Modular home.

The more slangy term is 'trailer' -but technically a 'trailer' is something that can just be hooked onto a truck and driven away.

• This can not be done easily with Mobile or Modular homes. It can

be done, but takes considerable preparation and requires special trucks and special permits to go on highways.

Another slang term is "Tornado Magnet".