Canis
The Mesa is a Canis SUV returning from earlier GTA games. Rockstar first showed it in an official screenshot (Leonida Keys 01).
Aleutian
First shown: Trailer 2
Astron
First shown: Trailer 2
Baller (second generation)
The Baller (second generation) is a Gallivanter SUV returning from earlier GTA games.
Contender
First shown: Official Screenshot: Ambrosia Postcard