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https://gmauthority.com/blog/topic/vin-decoder-list/
Here's a good site to use. No SPAM, and it gives you a lot of information on the result: https://vpic.nhtsa.dot.gov/decoder/

https://www.thechicagogarage.com/threads/website-for-rpo-code-lookup-from-vin-for-gm.174029/
Look in your glove compartment. There is a Service Parts Indentification (SPID) list. That will have all the pertanent RPO's to that vehicle.

https://www.silveradosierra.com/threads/gm-vin-decoder.526354/
This site will take the VIN a bit deaper for you listing just about every specification and option on the truck.

 

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