The number of miles ive pulled a 100lbs trailer with a ChinaGirl would boggle your mind. Average rolling weight of Tanglebones was 325lbs, including myself, bike, motor kit, trailer, gear, tools, blah blah blah. It pulled that 50 miles at a stretch, no sweat. In that 50 miles I climbed 1000ft in elevation, and never helped that motor up one hill.