if they have front diff locks then be carefull how you test it - otherwise you might find you've bought it cos you broke it and you will need a CV joint
ask about spare wheels - not sure they come with them
check high and low range, also see if they have heaters in place
as others have said, electrics. look at mounts for transfer box cos i know one owner had those fail
gearboxes can be 'notchy' when cold, check oil levels and a swap to synthetic can cure this, its just a trait of the iveco box
Post up some decent photos for us when you are back
Iveco Turbo Daily 4x4 40-10
Ex Owner LR101 300Tdi Ambi 'Tiggurr'