Don’t have direct experience with running extra equipment from a car, but I have researched it a bunch because I want to add a fridge, radio, box fan and lights in the near future.
The main factor I see is, when will the devices be used? While motor is running or while it is not. And how often will the motor be ran?
If you are working devices while the alternator is working, then not (as big) a big deal.
If you are parking the car with the engine OFF for 100’s of hours and expect to have the fridge / lights running, then you need an extra battery and solar.
One member just posted up how he was running a fridge in a suv in CA heat. I would use that experience as a base line for what you want to do.