This is my first post too. I use the prowler and a sled down a local parking lot when the offices are closed as it makes quite an annoying noise. It's not going to be quiet enough if you're using it in a neighbourhood (having said that it can't be louder than the rim you are using now).
Got a field nearby? Or industrial area?
Alternatively, find a tractor tyre and use that?
Hope that helps. I use the econo, it's awesome. Use it everyday. Hope that helps.