why is it called shiping if you put it on a truck?

Answer 1

Cargo is the product, shipping is the process of moving the cargo. It can be shipped by car, truck, train, plane or ship.
Of coarse one could ask why do we drive on a parkway and park on a driveway. Why is an orange called an orange but a grape is not called a purple?
Sorry had to put this one in Why when someone says they are going to the restroom they say they are going to take a "bad word", I allways try to leave one or two?

Answer 2

The fist means of transport for heavy items was by water. That's why canals were dug instead of roads for moving large loads.

As to the actual term of ship, that bears some thought. Often things on the vessel are referred to as shipping. The crew would "ship out". Taking water was "Shipping water".

Oddly most old European languages had a form of the word,
(From Wikipedia) Germanic *skipa-, perhaps ultimately a suffixed form of Indo-European *skei- ‘cut, separate’. Cognate with Old Frisian skip, Old Saxon skip (Dutch schip), Old High German skif (German Schiff), Old Norse skip (Swedish skepp)

Answer 3

The word shipping was used before trucks were invented. We still use the word trucking, but not as often.

Answer 4

For the same reason it's called cargo when you put it in a ship.

Answer 5

For the same reason you drive on a parkway and park on a driveway.

Answer 6

figure of speech