From what I could make out from my reasearch, the JGSDF started using the Type 73 Light Truck with the J20 model. It had a few changes over the years and was still called the J20, but was also known as the J24, depending on the version. The basic model was the J20 though, so it is a little confusing. That is why I went with the J20.
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The meaning of the JGDSF designation "TYPE 73" is not clear to me. It can also refer to other types of equipment: for instance there is a TYPE 73 tank, a TYPE 73 APC and a TYPE 73 cargo truck.
The JGSDF "Type" designation is like the US Military's "M" (Model) designation. You need the words after it to tell what it is; ie: Type 73 Light Truck (Kyu). The M designation works the same way. There is an M1A1 Abrams Tank, M1A1 Rifle, M1A1 Carbine, M1A1 Howitzer, etc...