Welcome aboard!
I was just checking out the satellite imagery around Grande Cache not too long ago thinking it might be one of the best places in all of Alberta for overlanding, with what seems like a huge amount of trails and FSR's to explore, so you are in just about the perfect spot to start exploring, I'd say.
Overland Bound is a great community and there's tons of good experience and people willing to share it, so don't hesitate to search around the forums, start a topic, and/or ask any of us whatever you need to know.
I think you'll have great success with the Suburban. One of the rigs on my expedition to the Rockies last year was an older suburban, probably similar to yours. Here it is in Ghost Valley:
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