Old Mate showed me to look, and feel with the hand, along the underside of the ducting, as Asw120 says, on your back on the floor if you can get on the floor inside the cab, if not (like me) ,stand in the doorway and squat down, with a torch, and look and feel for rust.
Inters and Dodges at that time used the same cabs, I think made by Richards in South Australia, so I think they are exactly the same.
I have my shoulder to the wheel,
my nose to the grindstone,
I've put my best foot forward,
I've put my back into it,
I'm gritting my teeth,
Now I find I can't do any work in this position!
