Is there any company out there that makes a fast commercial walkbehind. I love my ferris 52 dd, and if It went 8-10 mphs I would get rid of my ztr. I hate sitting all day, especially when I sit in the truck from job to job. If a company would make fast walkbehinds I'd have an all walkbehind line up. 36" 52", and maybe a 60". Anyone else wish they made walkbehinds faster?