Sales package, trailer integration

Years 2019–20, 2022–27 Models 5 Factory citations 22

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Also described as ProGrade trailering systemPackage, ProGrade trailering systemProGrade Trailering System

Also documented for Cadillac Chevrolet

Documented applications

Canyon — Third generation (VSS-T) (2023–2027)

2023–2026 Factory-verified

2025: S on all trims; 2026: Elevation, AT4, Denali: S; AT4X: not offered; the 2023 upfitter list names it a trailer integration sales package

GM factory document — 2023 gmc 23canyon electrical body builder 2023march13, p.14.
GM factory document — 2024 gmc 24 canyon electrical body builder manual 2023oct04, p.16.
GM factory document — 2025 gmc canyon fleet order guide, p.5.
GM factory document — 2026 gmc canyon fleet order guide, p.7.

Sierra EV — BT1 (2024–2027)

2025–2027 Factory-verified

2025 includes PZ8, THS, JL1, UET, TRG and UKW; 2026 and 2027 include UET, TRG and UKW; 2025: S in 5SC, 5SD; 2026: S in 4SD, 5SD; A in 3SC, 4SC, 5SC; not offered in 3SB, 5SB; 2027: S in 4SD, 5SD; A in 3SC, 4SC, 5SC; not offered in 3SB

GM factory document — 2025 gmc sierra ev denali fleet order guide rpo codes, p.1.
GM factory document — 2025 gmc sierra ev denali fleet order guide, p.5.
GM factory document — 2027 gmc sierra ev fleet order guide rpo codes, p.1.
GM factory document — 2027 gmc sierra ev fleet order guide, p.10.

Sierra — T1XX (2019–2026)

2019–2020, 2022–2026 Factory-verified

the upfitter lists read "Sales package, trailer integration"

GM factory document — 2019 gmc 19 sierra 1500 body builder feb 20, p.15.
GM factory document — 2020 gmc 20 sierra 1500 electrical body buil 1, p.16.
GM factory document — 2022 gmc 22 sierra 1500 new electrical body builder sm en us 2022jul20, p.16.
GM factory document — 2023 gmc 23 sierra 1500 electrical body builder sm en us 2022oct12, p.16.
GM factory document — 2024 gmc 24 sierra 1500 sm electrical body builder esid 23dec12, p.19.
GM factory document — 2025 gmc my25 sierra 1500 electrical bbm, p.17.
GM factory document — 2025 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

Yukon — T1XX (2021–2027)

2022–2023, 2026 Factory-verified

GM factory document — 2022 gmc 22 yukon yukon xl electrical body builder sm u 2021oct13, p.14.
GM factory document — 2023 gmc 23 yukon yukon xl electrical body builder sm en us 092822, p.14.
GM factory document — 2026 gmc yukon yukon xl electrical body builder manual service manual 2026 en us, p.10.

Yukon XL — T1XX (2021–2027)

2022–2023, 2026 Factory-verified

GM factory document — 2022 gmc 22 yukon yukon xl electrical body builder sm u 2021oct13, p.14.
GM factory document — 2023 gmc 23 yukon yukon xl electrical body builder sm en us 092822, p.14.
GM factory document — 2026 gmc yukon yukon xl electrical body builder manual service manual 2026 en us, p.10.

This page aggregates every documented appearance of ZL6 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.