Sounds like you got your work cut out for ya, but I would modify every part of that Dixie Chopper. The seat, suspension upgaded to a ferris style, new exhaust to get rid of any sound if I could, pulleys, tires, and canopy like suggested by others. Or you will never want to look at a lawn mower again after it kicks your butt on that ride.
96 Chevy 2500 Diesel
92 Chevy 2500
22' Tandem Axel Enclosed
18' Tandem axel open
2000 Lazer Z 60" 25hp Koehler
2001 Lazer Z 60" 27hp LC Kawi
2004 Lazer Z 60" 28hp EFI Kohler
Bunch of Trimmers, Edgers, Blowers!!