Do a web search.
There's a site for a guy out of Oregon that uses goats.
There's a site for someone in Tooele, Utah that rents pack goats
Someone in the Vernal, Utah area uses goats.
I've tried some borrowed llamas in Utah. I'd say unless you're willing to invest in your own llamas and dedicate some time to training and conditioning, they're a waste of wool.
I can backpack more weight myself and get there faster than poorly conditioned and trained llamas can -- and I'm an out-of-shape 50+year old.
Well trained and conditioned llamas are a different story, and I assume its the same with goats.
I used horses as a kid in Washington. Poorly trained and conditioned horses can still be useful in the amount of weight they can carry, but the downside is they're big enough to hurt you if you don't know what you're doing.