I rented a Tesla from Hertz over New Year's weekend. The car came 100% charged and they expected it at least 95% charged when returned. That's not great. I'd be concerned at buying one with batteries abused like this but it could provide a great study in long term charging levels on EV batteries.
I keep a 10/3 50' extension cord in my frunk for just such circumstances. Used it many times, no issues charging, no issues with the extension cord heating. 120v is a slow charge but quite usable.
We're an all EV household:
2019 Tesla model 3 long range
2022 R1T (soon to be)
No charger at home as we don't have a garage. Usually charge while out and about - grocery store, office, etc. Once in month or so I'll charge at a SuperCharger. Sometimes I'll plug into a standard household outlet...