Swapping car configurations should be more intuitive

🚧 THIS IS A TICKET MIGRATED FROM UPVOTY. The original ticket and comments will be available for a limited time over at:
https://abrp.upvoty.com/b/request-a-feature/swapping-car-configurations-should-be-more-intuitive/
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I signed up for the 14 day premium trial to try and plan out a trip while towing a trailer.

First, finding the option to add a trailer was a challenge - it was buried under car settings.

Second, once I added the trailer configuration, I had to go back and add a non-trailer configuration. A "standard" configuration should exist by default - adding a new configuration should add a second, not first, configuration.

Third, once the configurations were set-up, it was not clear how to switch the configurations for my planned route. The car selection button in the lower right just popped up settings repeatedly. I eventually got back to the "route settings", and switched the configuration. However, the route never updated. Despite adding a trailer, the stops and charge times were unchanged. This seems incorrect!