Re: Let's pull in there.
I believe it's one of those expressions that have outlived their literal meanings — like calling movies films even even though they're mostly digital now.
Before the world was filled with cars and trucks, people traveled by carriages and wagons that were pulled by horses and other animals.
And a when wagon arrived at its destination, the driver had the horses pull the wagon in to the place and stop.
Bonus trivia: A bygone term for car was horseless carriage.
I'm not a teacher. I speak American English. I've tutored writing at the University of Southern Maine and have done a good deal of copy editing and writing, occasionally for publication.