1)
What are "Arei Miskenos"?
1.
Rashi citing Targum Yonasan: They are store cities.
2)
In Divrei ha'Yamim II, 8:4 it says that store cities were in Chamas. Why does it not say so here?
1.
Malbim: Here it discusses cities for Shlomo himself. There it discusses cities for merchants to put their merchandise.