Almost anything where you need DC. I’ve been involved in ham radio for decades, wire is good. Getting through the firewall is always a challenge, so having that done is a godsend.
I have strobes on my rigs. As visibility for dusty forest roads.
The GM Upfitter guide will give you any idea of what they are and where they lead. There are specific versions for each year.
Page 80 of this document may help you get started.
https://www.gmupfitter.com/wp-content/uploads/2021/05/2011_Chevrolet-Police-Technical-Manual.pdf
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