Still believe for short runs, ice in a super insulated cooler is the way to go. Longer runs, purchasing 'good' ice is hard and gets expensive
Have a Costway 70qt chest style frig/freeze unit. can do either but not both single mode. Only run frig mainly because we have no need to freeze, anything. It's large enough for a weeks provisions and if we pack it correctly can keep meat frozen for a few days (packed at the bottom in a freezer bag).
I pre-cool 120v, though don't think it much matters.. Worst usage was in the Southwest (hot) and used 22amps in a 24 hour period. Best recorded was 12amps in the Atlantic Maritimes for a 24hr period.
I have a 60ah LiFePo4 battery and with the frig, lighting and some recharging get ~2.5 days. I'm upping to my 90ah soon to extend the days, yet w don't stay anywhere more than 3 days anyway.. It's in the cabin and separate from the vehicle except I charge mainly by DC/DC. I drive, I'm charging. My ATEM charger will do DC/DC or MPPT solar. Covers all the bases for me.
Would I do it again? Depends on pricing and what's new. Size, compressor (a must) and temperature range. I like chest style, just feel they keep food colder longer and can fit more. I often debate going smaller, this size runs well and fits a bunch of food!
Believe I paid $299 3-4yrs back on sale.
https://www.costway.com/product/70-quart-portable-electric-car-camping-cooler.html?fee=163&fep=14762&utm_source=google&utm_medium=cpc&utm_campaign=product&gclid=CjwKCAjw6p-oBhAYEiwAgg2PglLr_d6BhsOKfRrnjwCXFzxhkfLT8vCtk437NoCsKUIKPFf49KfkdBoC9X4QAvD_BwEThink that hit all your questions.