I haul around my son who is disabled, and/or groceries in my Wike trailer. http://www.wicycle.com/bst.htm I use it on my geared bikes. It's a pretty good quality rig. folds down real easy, and even converts into a stroller. I can fit about 8 paper bags of groceries in there. It's rated at about 150# which I have pulled up and down hills, but I wouldn't want to do it without some low gearing, and I wouldn't even try without 2 good brakes. They also sell a shopper, and a kit with the wheels, axle, and tongue for you to build your own trailer onto.