1)
To whom do "Arzei ha'Levanon" and "Alonei ha'Bashan" refer?
1.
Rashi: They refer to Giborim and officials, respectively, just like oak trees are lower than cedars.
2.
Radak: Both are metaphors for Nochri kings. These are the tallest trees - "Asher k'Govah Arazim Gavho v'Chason Hu ka'Alonim" (Amos 2:9). Targum Yonasan is 'Al Kol Malchei 1 Amemaya.'
3.
Malbim: The former are elevated due to intrinsic attributes, e.g. Chachmah, appearance or stature. The latter are lower (they are lowly, just they are haughty in their hearts).
1
Our text says 'Ravrevanei.' (PF)