Off that list there I've had to plump for the 504, purely for the memories of working in Yemen and being hossed about the desert in one.
ALL wagon's ROCK HARD though.
I am a complete wagon perv, & have owned a large quantity of ropey old clunkers over the years. They have all been ace... I just love the idea of chucking whatever you like in the back and trogging off with zero forward planning req'd