Do cars need to have a mezuzah?

Someone just sent me a picture of a packaged  item that said "car mezuzah," and they sent it   to me and asked me, does my car need a meuzah? So  to start, I think that was just a cute name for   a Tefilat Hederech, a traveler's prayer, that a  person could keep in their car. But the answer to   the question is no. Your car, your van, your truck  do not require a mezuzah because they're meant to   move, they're not meant for settled living.  However, if a person is going to be living in   a trailer home or in an RV for a long time, then  a person should ask their Rav if the way they're   going to be living in their RV or the trailer  home will necessitate putting up a mezuzah.