For 2019 it looks like the Premier has this over the LT: (Per Chevrolet Web Site)
Lane Departure Warning - Optional / Not Available on LT
Forward Collision Alert - Optional / Not Available on LT
Rear Cross Traffic Alert - Standard / Optional on LT
Infotainment With NAV - Standard / Optional on LT
Memory Seat - Mirror - Steering Wheel - Optional / Not Available on LT
Dual-outlet exhaust with bright tips - Standard / Not Available on LT
HID Headlamps - Standard / Not Available on LT
19" Wheel Standard, 20" Wheel Optional - LT has 18" Wheel Standard, 19" Optional
Bose® Centerpoint® surround sound audio system - Standard / Optional on LT
8-way power front passenger seat - Standard / Optional on LT
Heated Seats - Standard / Oprional on LT
Cooled Seats - Standard / Not Available on LT
Universal Home Remote - Optional / Not Available on LT
Adaptive Braking & Cruise Cruise Control - Optional / Not Available on LT
There are no differences in Engine, Transmission, Suspension, and Steering, they are all the same on Premier & LT. No Different tuning of these items across the line.
Lane Departure Warning - Optional / Not Available on LT
Forward Collision Alert - Optional / Not Available on LT
Rear Cross Traffic Alert - Standard / Optional on LT
Infotainment With NAV - Standard / Optional on LT
Memory Seat - Mirror - Steering Wheel - Optional / Not Available on LT
Dual-outlet exhaust with bright tips - Standard / Not Available on LT
HID Headlamps - Standard / Not Available on LT
19" Wheel Standard, 20" Wheel Optional - LT has 18" Wheel Standard, 19" Optional
Bose® Centerpoint® surround sound audio system - Standard / Optional on LT
8-way power front passenger seat - Standard / Optional on LT
Heated Seats - Standard / Oprional on LT
Cooled Seats - Standard / Not Available on LT
Universal Home Remote - Optional / Not Available on LT
Adaptive Braking & Cruise Cruise Control - Optional / Not Available on LT
There are no differences in Engine, Transmission, Suspension, and Steering, they are all the same on Premier & LT. No Different tuning of these items across the line.