You are a part of a tribe called the Twin Sisters.
You need to travel for about 3 weeks worth of travel, but there all no cars: You live in post-Nuclear Colorado. You need some type of animal to help pull your things like your cart of food, water, and gear, through the mountains.
My question is: What animal is best suited to pull the cart?
-The animal has to be able to handle large burdens.
-It has to be able to withstand cold.
-Be able to eat any available food.
-Climb mountains/steep rocks.
(Horses cannot be used, as they’re extinct)