Iveco Daily, (or the Isuzu/Fuso) I dont think any of the standard commercial utes will meet your 1.4 ton payload figure, you are in truck territory by a fair margin.
Which is why I suggested the F250 4Door.
More dealer support, over more of the Country.
Your in need of at least a 2 1/2 tonne truck or bigger to get anywhere near the figures your talking about.
Iveco may have a vehicle that compares to or meets your specs. Another Country wide Dealer network, already in place.
Isuzu will definitely have a small truck that meets your specs. Also with a Dealer network Country wide.
Your utility reference Doesn't fit with your stated specs.
You may get near it with a 70 Ser. Utility with a suspension upgrade from J-Max Engineering.
But two people will have to sit on the tray if you insist on a crew of 4 on board.