All Terrain package

Years 2009, 2014–19 Models 5 Factory citations 15

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Also described as Appearance package, GMC All TerrainAll Terrain HD package

Documented applications

Acadia — Second generation (C1XX) (2017–2023)

2017–2019 Factory-verified

2019 guide: SLE-2, SLT-1: O; only in: AWD; 2017: SLT-1 only; 2018–2019: SLE-2 and SLT-1; includes the rear air vents, 5-passenger seating, Black roof rails, Hill Descent Control and the advanced AWD system (G99); from 2018 the 5-passenger seating may be swapped for 6 or 7 seats

GM factory document — 2017 gmc acadia order guide copy gm authority, p.12, p.22.
GM factory document — 2018 gmc acadia order guide copy gm authority, p.14, p.28.
GM factory document — 2019 gmc acadia order guide copy gm authority, p.14, p.15, p.30.

Canyon — Second generation (GMT31XX) (2015–2022)

2015–2017, 2019 Factory-verified

2015–2016: SLE: O; SL, Canyon, SLT: not offered; 2016 contents include Z71, JHD, R1U wheels, QHE tires, VT5, NY7 (4WD), HJX interior, KA1, AAQ, AL9 and AT9; the upfitter lists name it appearance package, GMC "All Terrain"

GM factory document — 2015 gmc canyon fleet order guide wayback, p.2.
GM factory document — 2016 gmc canyon fleet order guide wayback, p.2.
GM factory document — 2017 chevrolet canyon colorado electrical body builders manual service manual 2017 en us, p.10.
GM factory document — 2019 chevrolet 19 coloradocanyon body builder sm u 2018aug01 1, p.10.

Sierra — GMT900 (2007–2013)

2009 Factory-verified

GM factory document — 2009 gmc sierra 2wd rpo code list, p.1.

Sierra HD — K2XX (2015–2019)

2015, 2018–2019 Factory-verified

4WD only; LT265/70R18E all-terrain tires (QGM), rear park assist (UD7), off-road suspension (Z71), underbody shield (NZZ), fog lamps (T3U), all-terrain grille insert, body-color bumpers (VB5, VT5), sill plates and carpeted floor mats (B58); limited to six exterior colors in 2015; the 2018 guide limits it to Crew Cab and adds the spray-on bedliner (CGN); 2015 marks: Sierra: not offered; SLE, SLT: O; 2018: GM's 2018 Sierra 2500HD order guide; 2019: named in the 2019 interior page's package contents or footnotes

GM factory document — 2015 gmc sierra 2500hd fleet order guide wayback, p.3.
GM factory document — 2019 gmc sierra 2500hd fleet order guide wayback, p.1.
GM factory document — 2018 gmc sierra 2500hd order guide copy gm authority, p.18.

Sierra — K2XX (2014–2019)

2014, 2016–2018 Factory-verified

the 2016 guide limits it to Crew Cab and Double Cab.

GM factory document — 2014 gmc sierra 1500 fleet order guide wayback, p.3.
GM factory document — 2016 gmc sierra 1500 fleet order guide wayback, p.3.
GM factory document — 2017 chevrolet sierra silverado electrical body builders manual service manual 2017 en us, p.19.
GM factory document — 2018 gmc sierra 1500 order guide copy gm authority, p.88.

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