Does "Ki Hu Rodeh" give the reason for his daily meal?
Radak: Yes. The wild goat, deer, Yachmor 1 and Barburim Avusim were gifts from kings on the other side of the river, who feared him.
Malbim: No 2 , it is why he had so many horses (verse 5). They were prepared for war, if needed. Through them he ruled over kingdoms, for they knew that he has [a great] army, horses and chariots, and feared him. Through this, he did not need to fight. Normally, one is Rodeh (subjugates) nations only after fighting and conquering them
Yachmor is one of the seven Kosher Chayos (Devarim 14:5); its identity is not clear. (PF)
Where are "Tifsach" and "Azah"?
Radak citing Megilah 11a #1: They are countries at different ends of the world.
Radak citing Megilah 11a #2: They are countries on the other side of the river, next to each other. Just like he ruled over them, he ruled over the entire world.
Why does it say that he had Shalom "mi'Kol Avarav"?
Malbim: Also the counties that he did not subjugate, they feared to fight against him.
