And just a general observation in reply to
Yaj Yak 's mention.
Scag, Exmark, Toro, etc all make a 30" commercial walk behind, but they are very expensive as you'd imagine. Unfortunately, they do not go cheap at auction or I would own one for my personal use. They are machines that are typically purchased new and held onto until ran into the ground by companies because they don't see much use. Same reason why 36" walk behinds are very expensive. Guys keep one on their trailer, only use it for a handful of accounts a week, use their 48's the majority of the time and thus just keep them around.