Abstract: Devices and methods of transporting a load (e.g., a backpack) over surfaces, such as an uneven terrain, are disclosed. In one instance, a frame and harness designed to attach to a standard backpack are disclosed. The device allows a hiker to pull or carry their backpack. In one embodiment, the cart has a frame with one or more wheels mounted at one end, and one or more handles extending beyond the opposite end. While being used to pull the backpack, the cart can be partially suspended by straps connecting the shoulder harness and the handles, thus freeing the hiker's hands without unduly restricting his/her freedom of movement. The cart can also be designed so that an attached backpack may still be carried in the normal fashion without detaching it from the cart. Other features of such devices, and methods relating to the use of load-bearing devices are also disclosed.