Roberts Fund for A Titanium Wheelchair

I am in need of a lightwieght titanium wheelchair as my Huntingtons Disease has progressed  to the extent that I cannot walk more than 25 meters at a time. Titanium is barely 11 kilograms compared to a regular wheelchair which is approximately 20 kilograms. Lighter is better for both my wife and myself as she is petite and I have a serious problem lifting objects.