Tow mirrors were not offered by GM on the 2019 1500's.
In 2019, the HD's were style the older style body and the older style tow mirrors.
In 2020, the HD was updated to the new 'everything'.
The new tow mirrors were released and available for 15/25/35.
Tow mirror offerings in 2020 depended on trim level.
DQS version only available on LTZ and HC
DQS NEW! Mirrors, outside power-adjustable vertical trailering with heated and auto-dimming upper glass, lower convex mirrors, turn signal indicators, puddle lamps, perimeter lighting, auxiliary lighting and memory; power folding/ manual extending
1 - Requires (CWM) Technology Package. Includes (DP9) chrome mirror caps.
DPO Mirrors, outside power-adjustable vertical trailering with heated upper glass, lower convex mirrors, integrated turn signals, clearance lamps and auxiliary lighting; manual folding/extending
WT - Requires (PCV) WT Convenience Package or (PEB) WT Value Package and either (Z82) Trailering Package or (ZW9) pickup bed delete. Includes (DD8) auto-dimming inside rearview mirror.
Custom - Included and only available with (BD1) Custom Max Trailering Package.
LT & RST - Requires (Z82) Trailering Package. Includes (DD8) auto-dimming inside rearview mirror.
LT Trailboss- Includes (DD8) auto-dimming inside rearview mirror.
Neither was available on Custom Trailboss