After reading this forum for a couple of years I have joined for the express purpose of answering this post. I am the owner of a Willydog pushcart, the Classic New York. Although it has served me well enough I was quite unhappy with the quality of its construction and its unusual design. Additionally, receiving it was a nightmare. I can elaborate on both issues, but I would be remiss if I did not warn you against the purchase of any cart from that company and its many similar web sites ("Willy Dog", "Carts of Canada", "Worlds Best…", etc.)
Good Luck with your venture!