I have several properties with ditches. Some are too steep for my Gravely 36 ProStance, some are too narrow at the bottom for the 36 to even be able to cut at all. Currently, I'm using a 21" Troy Built with a Honda engine. I've used it quite a bit for a year and a half, and now the Troy Bilt parts are beginning to fail. I'm going to need a replacement sometime this season. Hence my question: Is there a 21" - 30" commercial walk behind around? If I could get swivel/caster from wheels, hydros, and a Kawasaki engine it would be perfect. After several google searches, I've learned that Exmark makes a 30" commercial, and Gravely has a 28" model. Is that all there is or am I missing something?