The wright is the only one that I know of for sure as I specifically asked about this. The wright is goes up to 5 inches. This is the front runner in my mind before any actual demos are done so I have inquired a little more about it than the others. I know that ferris generally goes to 5 on the Z's I have used or owned from them. The scag and the toro I honestly have no idea but will report back as I demo them.