Quite often funeral homes operated the ambulance services also, especially in rural areas. These cars came equipped with two seats. A small single seat was left in the driver's position, so that a stretcher could be placed on the passenger side floor, front to rear. Moreover, these cars were quite often used for "first call" to pick up the deceased. On the day of the funeral, a small portable crane-dolly mechanism removed the single driver's seat and set in place a full front seat for use as a limousine style car for the funeral. Actually, pictures I have seen show the pillar oening with the rear door. I suppose that the pillar could be anchored top and bottom for times when the fore and aft use was not required.