The Traveler 1st Generation (triple-fold) is one of the smallest folding trikes made.  It would be the best candidate to fit into the trunk of a sedan.  Good shape.  Seat has a wide range of incline positions (the one shown is fairly laid back, but it can also tilt up so that the rider is mostly upright).  24 speed twist-grip derailleur shifting.  Includes seat bag.  Also includes versa bars that aid in entry/exit as well as mounts for water bottle cages.