Paroh commands Yoseph to take wagons & send them to his family to bring them to Egypt. Yoseph takes & sends them. Ya'akov sees the (calf drawn -yonasan ben uziel) wagons that yoseph sent & is thereby consoled. He thentravels to Be'er Sheva with no mention of the wagons & after receiving a vision & message from Hashem he goes to mitzrayim - on the wagons. (He didn't want to use the wagons for his own use as pharoah gave them with the intent to immigrate to egypt. Meshch chochma?)
We may ask why did Pharoah have to express himself so strongly -"v'attah tzuvaisah zos assu" - "And you are hereby commanded, this you must do." just to give permission for yoseph to send the wagons?
the da'as zekeinim makes a diyuk that the wagons were for the family, but pharoah wanted Yakov to be CARRIED by his sons.
perhaps pharoah was scheming.... He knew that the 400 years may be not full slavery & was concerned that Yakov's yeridah to egypt should not be the beginning (little did he know the numbers could be counted from even before that!) so that it can be 400 years of real slavery.
Therefore he wanted the family to come in respectful wagons - and yakov be carried as a sign of royalty - so that it cannot be the start of galus.
Yakov didn't even allow family to use wagons for this concern. Until he had a prophecy from Hashem that this was already part of the cheshbon of galus as Hashem had to tell him not to fear & "I will go down with you'' which is the assurance that Hashem is with us in exile. Then in the next pasuk it clearly says yakov allowed himself to be carried & the family went in the wagons.
