I just unpacked this thing and am struggling to assemble it, so far, although it is very heavy, it is yet flimsy, the clamps don't stay in place, there is no way it will stay together to turn on it's side to put on the wheels.  There are several big gaps along the corners, I think a cat could break out of this very easily.  So far the one I bought about 15 years ago, a different brand, is much much better.  This thing sucks.