The Ford name for it is Integral Body/Bodied ...uni is the slang nickname its gotten..
It was made from 1961-1963
They were in F100 thru F350 series pickups
A factory 4WD integral bodied pickup was never manufactured
Integral bodied pickups doors to be original style will have a straight sloping
body line whereas all of the other F series trucks have the scallop or drop
area by the vent window.