we look at things differently. thats a good guess. me I see a seat that has had lot of stuff pilled in back of it. put in were if it was there when in uses, would have the left side in ribbons putting the gurney in and out. it can't swivel were it is to face the pt, has switches either side of it you can't reach from it, with no trim around it at the base. weight is right at a sack of cement. it's so large if you were putting 4 people in you would have to leave it at the incident. . but no visible way to easily remove. it is the same color and stitching pattern as the front seat in the car. so either the drivers seat wore out and they replaced it with a good bench from another car. put the good seat in back. or they robed the passengers seat out of the other car to replace or add a seat in the rear. now MM had some interesting seating arrangements in these cars for sure, but putting one to big to slide the main gurney in place was not one I have ever seen before. for the most part there stuff was at least user friendly even if dam uncomfortable. but thats just me I really have no idea who, what, were or why
Mike that's a different way of putting the hangers together. in you picture. now if I understand Mm right the screw holes added to the floor are to put in the removable attendants seat in them.