It may be long, at 339 pages, but I'd imagine the "Industry Profile on Wheeled Mobility" recently published by the University of Buffalo is a must read for rehab providers. In five chapters, it details "funding and legislation, standards, accessible public transportation, wheelchair transportation safety, along with an interpretive overview." Two additional chapters cover market demographics and a comparative analysis of consumer perspectives.
You'll recall that the industry is working with University of Buffalo and Georgia Tech University to compile a broad study of the power mobility market. This profile is a separate effort.