1)
Why does the Torah say "Yachanu" after "ha'Mishkan" for Gershon and Merari, and for Kehas, "Yachanu" precedes "ha'Mishkan?
1.
Moshav Zekenim: Gershon and Merari had wagons to carry parts of the Mishkan; they camped were further from the Mishkan, and could ride to the Mishkan in the wagons.