The biggest difference is the towing tech group requires the tow mirrors.I dont understand the difference between the Towing Technology Group and Trailer-Tow Group. I've tried google and searching several different forums but cant find the differences.
We have the top three and love it...dont see the need for the last honestly.You must add these IN ORDER
STANDARD FEATURES:
Trailer brake control
Class IV Receiver Hitch
7&4 Pin Wiring
TRAILER TOW GROUP
Must have Level 1 Equipment Group (this is new change)
Trailer reverse steering control
Trailer TPMS
TRAILER TOW MIRRORS
Must have trailer tow group & Level 1 Equipment Group
TOWING TECH GROUP
Must have trailer tow group AND trailer tow mirrors & Level 1 Equipment Group
Hitch Lineup Assist
Trailer Reverse Guidance