In addition to the set of adapters I posted earlier, I also carry this set of connectors. Since the NEMA 14-50 is critical to my adapters, I have an extra, just in case.
In addition to two Tesla charging cables, I carry a 30 foot extension cable. Although I use the extension cable infrequently, there have been times when access is limited and the extension cable gets me plugged in. Why two Tesla cables you may ask? A bear chomped down on my first one, pulling it clear out of a NEMA 14-50 socket. Although the cable still functions, some damage occurred so I keep it as a spare.
Last but not least, I carry a 40 foot 125V extension cord and plug extenders. Both of these REALLY come in handy when I sleep over at RV parks. During a dry run up the coast of California, I was caught in a freak snow storm on Hwy 299. It took 3 days before the roads were cleared, but I was able to wait it out at a RV park along the way. I stayed warm, thanks to a small electric heater I brought. I snaked the extension cord out the window, connected it to the Park's electrical panel and set the heater so I was toasty warm. No need to use the car's heater or worry about it "timing out".