Mercury D528
The Mercury D528 was a concept car built in 1955.
The D-528 was built to test advanced concepts in seating, lighting, air conditioning, and front frame design. The hinged rear fender bulges were functional, concealing a spare tire on one side and a gas tank on the other. Such a design gave the car adequate luggage capacity despite the need to accommodate a large air conditioning system.
Although it boasted design features such as a pillarless windshield and Ford’s first reverse-sloping retractable rear window, it was an in-house research vehicle that was never shown publicly.