Restaurants in GTA games tend to be background unless a mission needs them. Trailer 2 has restaurant facades visible in several frames - we catalogue what we can see.
Visible categories
Outdoor cafes on the strip. Diners in the rural towns. A high-end restaurant interior briefly in trailer 2. Strip-mall fast-food. The full Florida restaurant vocabulary.
Specific named brands are hard to read off trailer frames. Returning Rockstar food brands - Cluckin' Bell, Up-N-Atom, Burger Shot - are plausible.