In Joshua 14-17, the tribes of Judah and Joseph (Ephraim and West Manasseh) are distributed first and together take up the majority of the land. The distribution of this land for Judah and Joseph seems altogether to be a different kind of distribution than that of the other tribes. The land left over after the distribution to Judah and Joseph was to be surveyed by members of the other tribes and was then distributed to them by lot (Joshua 18-19).
My question concerns the reason behind the prominence of Judah and Joseph in the distribution of land. Why are they set apart and dealt with differently? I'm trying to think of anything in the greater narrative that would warrant this. I also am thinking that the territories of Judah and Joseph eventually become the northern and southern kingdoms of Israel and Judah (with fluctuating boundaries) and that possibly has something to do with it.