Hase bikes has some pretty unique
special needs offerings. They make many styles of recumbents and trikes and a rear captain tandem. The
Trets is the most unique in their lineup. It is the only bike I know of that has an integrated trailer adaptation and is purpose designed for special needs. They are pricey compared to other options. The quality of the build appears to justify the cost. If you have longer term needs and a trailer setup is a workable solution, these can be a very good option.