The Seep
Ford was the only builder of the GPA, it used many of the same parts as the Ford GPW Jeep
1942 and 1943 were the only years that GPA's were built
Approximately 12,000 units were built.

The Seep swamped easily and after military tests was soon dropped

A interesting web page about the Seep with many photo's

Below are three photo's of the Alligator, click to enlarge

#2 testing
#3 In use
A Coast Guard DUKW training at Ft Story. 1950-53
Online photo found, no story with photo
A DUKW with a mounted flame thrower