One of the DTW workshops makes wheelchairs.  There is a huge demand for appropriate wheelchairs in Cambodia where one out of every nine people is an amputee.  Several different models are produced, to fit the size of the person, the degree of use of arms and legs, and the terrain where the buyer will live.  Probably every wheelchair in Cambodia should come with one of the towable graders included.  Accessibility is no laughing matter in Cambodia where few roads are paved even in the capital city.