LPO, trailering equipment package, Class II 1-1/4 inch receiver hitch, 4-wire connection

Years 2015–18, 2022–26 Models 2 Factory citations 6

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Also described as LPO, trailer hitch, fixed

Also documented for Buick Chevrolet

Documented applications

Savana — GMT610 (2003–2027)

2015–2018, 2022–2026 Factory-verified

GM's list calls it an accessory

GM factory document — 2015 chevrolet express savana electrical body builders manual service manual 2015 en us, p.15.
GM factory document — 2018 chevrolet 18 express savana bodybuilders sm 2017nov06, p.16.
GM factory document — 2022 chevrolet 22 express savana electrical body builder sm en us 2021oct12, p.14.
GM factory document — 2026 chevrolet my26 express savana electrical bbm, p.12.

Terrain — First generation (2010–2017)

2016–2017 Factory-verified

SLE-1, SLE-2, SLT, Denali: dealer-installed or available; the 2016 guide marks it new

GM factory document — 2016 gmc terrain fleet order guide wayback, p.4.
GM factory document — 2017 gmc terrain fleet order guide wayback, p.4.

This page aggregates every documented appearance of SDD in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.