Very early on in my career we flew books out of SIN on a 707. Of course, as everyone knows, paper is about as dense and heavy as lead - but seeing that the pallets only came up to my knees, I suggested that we put more cargo on. Luckily, my partner was considerably wiser and countermanded that suggestion pronto!
We've also carried a lot of VAL cargo; ranging from gold to banknotes; as well as diesel/fuel oil in leaking drums.
As for earthmoving equipment/green medicine/agricultural equipment ... you might think that; but I couldn't
possibly comment!
The worst cargo we ever carried was a shipment of pigs going down to West Africa - God, what a stink!! Took months for the aircraft to be flyable without judicious use of oxygen masks...
