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Question:

What is the main difference between a portable tank and a cargo tank?

A All of the above are correct.
Explaination

There are several key differences between cargo tanks and portable tanks, but the key facts have to do with the permanence of cargo tanks. Since they are stuck to commercial vehicles permanently, they will be filled while they are on the vehicles, and they do not need to display an owner's name separately. A portable tank can be filled while off a vehicle, then attached, and it must display the owner or lessee's name.