Often referred to as the "Fridge" generation because of their squared-off, boxy styling that resembled mid-century refrigerators, the 1957-1960 F-Series (Third Generation) was a massive leap forward for Ford:
The Styleside Bed: 1957 marked the first time Ford offered the flush-fender "Styleside" bed as a standard option, completely changing the look of pickup trucks forever (prior to this, step-side/Flareside beds were the norm).
Modern Cab Design: Ford integrated the cab and the front fenders together seamlessly for the first time, removing the running boards and creating a much wider, more modern interior.