Roof load requirements

Does anyone know of a good resource to look up roof load requirements for a home based on location?

I’m placing an order for a home that is being shipped to Wyoming, and the sales rep told me I need a 30lb roof load. I’d like to double check this though since in my experience:
-Many of the sales reps are very nice, but many don’t seem super knowledgeable
-Sales reps are always pushing hard to sell options on homes

Here you go:

http://www.manufacturedhousing.org/roof-load-zone-map/

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