I have been using a chain for a while, but I finally got off my butt and went and bought some metal and built this box last week. I like the chains, but I think I will end up liking the box better. This one i made is 50wide x50deep x33tall or somethin like that and has a chain for a extra dog on top. It probably weighs about 80-100lbs., but it can still be lifted in and out by one person.