I saw this item being used as a handicap chair and it quite impressed. About the best I've seen so far. Very expensive but built about as strong as a car trailer. As one can purchase just the base and fit it out yourself should be able to get the CofG down. Rear wheels about 12" front (?)8"
http://www.tumbleforms.com/smaladcarrov3.html
http://www.tumbleforms.com/carrierovers.html
An other view. ---- http://www.fasequipment.com/catalogue/seating/s6.htm
An other idea. ---- http://www.healthcare.ottobock.com/
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