I agree Laofan, that it is baffling to see the term "coupe" applied to SUVs, CUVs, and four door sedans.
Mirriam Webster gives the historical definition as:
.....a four-wheeled closed horse-drawn carriage for two persons inside with an outside seat for the driver in front
as well as, the automobile-related definition:
...... a 2-door automobile often seating only two persons
It seems the word has been hi-jacked, by modern marketers who have grown bored with the facts.