Look at Stone Glacier. They are known for being ultralight weight yet super stout. They're pricey but if you search some threads you'll see that they're very highly regarded and all of their packs will fit on all current and past frames (something that can't be said for Kuiu. Their setup is...
Bring knee pads and leather gloves for crawling on the high-prairie. All good advice from what has already been said. Antelope have eyes like hawks so you will want to minimize your appearance as much as possible!