I was able to pull up the owners manual of your 2016 Chevy Sonic online and on page 291 I was able to find the protocol for flat towing the vehicle:
Put the transmission in park and then turn the ignition to off.
Set the parking brake.
To prevent battery drain remove the DLIS fuse from fuse block see page 252.
Turn the ignition to the ACC position.
Shift the transmission into neutral.
Release the parking brake and you're ready to go.
You'll need to put the DLIS fuse back in before... view full answer...
If your 2021 Silverado 1500 4x4 LTZ has a transfer case with a Neutral and a 4WD low setting, it can be flat towed. I don't have a way to look up what the 4WD style the LTZ models might have.
You'll need base plates like the Blue Ox # BLU54VR, a tow bar like the Blue Ox Alpha 2 tow bar, part # BX7380 which also includes the safety cables you'll need.
For lighting you can use the diode kit, # RM-15267, and not have to worry about cutting into the taillight housing. This will splice into... view full answer...