Victory, are you looking specifically for something with a roller-type gauge assembly? I haven't seen that on any of the "tight-turn" mowers, but I believe that all of them have gauge WHEELS, which serve the same purpose. I'm not sure if they have gauge wheels on the center part of the deck, but they do have them on all for "corners." I don't have a "tight turn," but all three of my small tractors have gauge wheels, and those do the job on my uneven areas. And Yes, some type of wheel or roller is needed to keep your deck from digging in on uneven areas and during turns.

Looks like the Craftsman TightTurn mower linked below has 5 roller wheels on it. Also you could probably figure out how to attach the accessory JD roller and bracket shown here:

http://www.ebay.com/itm/JOHN-DEERE-EZTRAK-54-DECK-ROLLER-KIT-FITS-Z425-Z445-BM22595-/161226287256?pt=LH_DefaultDomain_0amp;hash=item2589d5e898

Here is a link that might be useful: Craftsman TightTurn 48-in. Yard Tractor

WOW/ Thanks guys!!