There are two camera systems available: 270 (UVI) deg and 360 (UVS) deg. The 270 deg is available on LT and up trim levels. The 360 deg is available on LTZ and HC. You can get LTZ and HC with either system.
The 270 deg system is a 4 camera system where the truck has two cameras in tailgate and rear chimsel plus ability to add two trailer cams.
The 360 deg system is a 7 camera system where the truck has five cameras in tailgate, chimsel, osrm, and grill. You can add two trailer cams as well.
The 360 deg system has up to 15 camera views. It has the transparent trailer view, adds turn biasing, and turn signal biasing. The 270 deg system you basically will only have bed view, hitch view, behind trailer, and inside trailer views available. It lacks the views you get from front grill and mirrors.
Hope this helps.