There’s a common belief that K was driving off to visit R alone while courting her, but the show and the Brown family’s book say otherwise.
In this Season 1 scene, even Robyn’s daughters were disappointed that none of the other moms came along. They ask, which other mom is coming as if that was the usual setup.
That matches what Becoming Sister Wives describes: Kody would visit Robyn with a rotation of his wives and kids so she could meet everyone gradually.
So the Maddie/Aspyn trip we see in S1 wasn’t the norm. It was the filmed proposal, possibly because TLC thought it would be too weird for the proposal to happen with a wife along for the trip, even if that's how Christine’s proposal was done.
This wasn’t just how it worked with R. K also brought Janelle with him when he traveled to propose to Christine, which fits the same pattern of group visits with family members.
Most visits were group trips.