The Thelemark Inn (its an odd spelling) used to (and may still) run llama packing trips into the wild river area. My brother and friends went on a couple of the trips and the owner had told them that he wanted to do trips in other parts of the whites, but the forest service wouldnt allow him into high use areas. They actually were trying to have him move their trips up the Kilkennys.
The llamas were best suited to hiking old logging roads, if the footing got slippery or rough, they tend to get injured. My brothers group went on the one and only trip up Unknown pond trail and the owner swore that he would never go there again as the trail was too rough.
Even in the wild river area, the llamas were used to bring people up to a basecamp, then the group would dayhike solo without the llamas up to Carter Dome, while the llamas hung out at camp.
BTW, the llamas are not supposed to eat the local vegetation, but getting the concept through to the llamas is not real effective.
Of course the alternative to llamas are pack goats !. They apparently are much better suited to our terrain, but they dont have as good PR as the llamas.