You're absolutely right the Tucker truck isn't an F-250, it's an F-600. However when Ford changed the light duty pickup bodies for the 1973 model year the cab on the medium duty trucks changed as well for the 1973 model year. (I mentioned my F-250 fleet only to make the point I am more-than-familiar with the dentside trucks.)
1959 was the first year of factory four wheel drive in Ford pickups.
The F-600 info in your link is in Spanish (and shows a bumpside truck). In foreign markets all bets are off. For example Chrysler sold Dodge trucks under the "Fargo" brand in Canada and other countries into the 1970's and beyond but stopped selling Fargo branded trucks in the US in 1930.
[It has nothing to do with Ford, but I'm also an FJ40 enthusiast. Toyota stopped importing FJ40's into the US in 1982 (I think, might have been '83). However they were sold well beyond that in other countries and up until maybe ten years ago in Brazil where they were called "Bandeirantes".]
Here's a photo from a 1972 Medium duty Ford truck US sales brochure:
http://www.mclellansautomotive.com/photos/B38139.jpg (note the bump on the sheetmetal and the grille's styling). Compare that photo to the "Tucker" truck.
Now a photo from the restyled 1973 line:
http://www.mclellansautomotive.com/photos/B34300.jpg
You'll note the different body shape, grille and the fender mounted turn signals are no longer round.