2020 GMC Sierra HD AT4 All-Mountain Concept
![](https://i.ytimg.com/vi/OR6FYFFMHA4/maxresdefault.jpg)
The Sierra All Mountain takes GMC’s signature bold design and innovative engineering excellence to new heights, adding tank-like tracks that help it navigate …
2020 GMC Sierra HD AT4 All-Mountain Concept
The Sierra All Mountain takes GMC’s signature bold design and innovative engineering excellence to new heights, adding tank-like tracks that help it navigate …
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