What are "Dan v'Yavan"?
Rashi: They are countries.
Verse 13 already taught that Yavan were peddlers!
Malbim: There is it taught that they gave slaves and copper Kelim for collateral; here it teaches that Dan gave also iron bars?
What is "Me'uzal"?
Rashi: It is silk yarn.
Radak: It is going, like "Azlas Yad" (Devarim 32:36), "v'Ozel Lo" (Mishlei 20:14). Yonason translates 'Halach' as Azal 1 . The Pa'ul conjugation is used, for they went constantly in caravans. Also Yonason translates 'b'Shirin'.
Malbim: They are spun matters.
Also Onkelos does, e.g. Bereishis 31:19.
What is "Barzel Asos"?
Rashi: They are iron bars; it is Indian iron.
Radak: It is clear iron, like "Eshes Shen" (Shir ha'Shirim 5:14).
What is the meaning of "Ma'aravech"?
Radak citing Targum Yonasan: In your stores.
Malbim: It is security [for matters that they took to sell].