With our 48" TTHP we originally bought a swivel wheel sulky with solid rubber tires instead of pneumatic. Hated them. Kept pointing the mower up hills even on an incline that wasn't that bad. Got the standard dual wheel sulky and love it. Just keep the regular air wheels and get them filled with the special foam (not the canned foam you buy from walmart. If I remember right it's done by a wheel shop). Let it sit for 2 days to let the foam form up and you'll be good to go. Best $200 we've spent.
Best Impressions Lawn Care - est. 1998
(7 years previously under different name/ownership)
'11 Toro Grandstand - 48" 24HP Kawi
'09 Exmark TTHP - 48" 19 HP Kawi
2 44" Toro's (300 series ZTR and ProLine WB)
Shindaiwa weed eaters
Stihl Backpack Blowers