I've been in the wheelchair biz for 30 plus years. These are some of the nicest folks you could ever meet. They are based out of University of NH.
http://www.nepassage.org/
First rate and a very good resource for kids that face the challenges of adaptive sports, and recreation.
Quick story to illustrate. The boss and I have a family friend who is an amazing young man that uses a wheelchair permanently. The team at Northeast Passage was able to find us a guy with a hot air balloon that had a basket with a door! For his 13th birthday we were able to take him on a hot air balloon ride!
You'll find all sorts of programs in New Hampshire at this site.
http://www.usatechguide.org/techguid...de=1&catid=453
Nice thing you're doing!!