What are the wire connectors called in the photo I attached below (dangling)? Obviously I have a bit of an issue going on here!

Is there a better connector to use, or perhaps a better way to zip tie things together so this won't happen again?
I get under the trailer pretty often, so I am certain this breakage is pretty recent. Yet another thing to add to the "frequent inspection list".
__________________
Todd
2019 Micro Minnie 2108DS with
upgrades and mods here
2020 Toyota Land Cruiser, RedArc TowPro-Elite, Andersen 3380 WDH