Batteries
there is deep cycle batteries, agm batteries, lifepo4 batteries, all different chemistry
you can wire the the vehicle "alternator" to charge a second battery so you don't get stuck with a dead battery,
sometime called the big 3 upgrade, popular with car stereo people, requires large wiring to be run to your battery from you battery and a way to install a switch to turn on off, and switch between along with fuses at all wiring places, like large tube type car stereo subwoofer fuse blocks, and 'buses' to connect it all.
solar power a battery, and or get a jackery a bluetti power station, popular choices to charge somethings and can be plugged into a cigarette lighter to recharge or a wall outlet or solar panel all at the same time while giving power, very simple way around massive wiring, limtied in size though unless buy a giant power station then you have more power, regardless can run a 12v fridge like the cooler fridges for the night or even up to two days depending on the model ,a eb3a can run a iceco jp30 fridge for 2 days, other brands of similar size are less effiicieint but can reach the freezing temp, of 0 degree or 32-37 degree like a fridge so a good way to keep food chilled properly, without any solar or large battery bank or anything just drop in car and go
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guy on video said he was running an alicool freezer cooler down to 32 degree like a fridge off of a 170 miliamp battery.