I live like 5 blocks from the Trek manufacturing plant here in Waterloo, WI, so I could go to them and have them make me this thing any time, but I'd rather buy a used one first. I have a Husky who was born to pull... I put a harness on him, and he drops his head to go.. I don't have a sled or a cart, and the snow is melting here, so I don't think a sled will do me any good at this time. Any one here have a single dog cart they are willing to part with so I can train my dog in the proper fashion, and get some good exercise while I'm at it? By the way, the dog is 47.5lbs, and I'm 220, so a very lightweight cart would be good... wheels can be any type, but I'd prefer knobby 12inch tires so I can run the trails he'll be sledding on next winter. Road tires are ok, but not preferred... I am willing to pay for shipping from anywhere in the US or Canada.