I think Kamala's road trip is a trial run for the 2024 campaign.
Kamala has failed at every assignment she's been given. She has the mental and verbal coherency of Ozzy Osbourne. On many public events, she sounded like she started day drinking the day before, and uses wine to wash down a handful of Vicodin.
She failed at Border Czar. She failed at Ukraine Czar. She failed at Electric Vehicle evangelist. The only people in the Biden admin that could give her a run for most incompetent would "Pothole" Pete Buttigieg and Jake Sullivan.
The only way to save face for Biden is to "promote" her to another position so can select a VP that will excite young progressives and African-Americans.