The things you mentioned were prob meant to be used by passengers while the vehicle was running(driving). Not when it was parked.
I paid about $450-$500 for my starter 100w solar kit. Approx $250ish for 100w panel\PWM charge controller\tray wires(from CC to Battery), about $120 for deep cycle battery, $30ish for fuses between battery and 3 ciggy plugs, and then prob $50-$100 for ciggy plug splitters. Had that for awhile now and wanting to upgrade. But, point is, $500 bucks can set you up to charge a few tablets, a phone, 3-4 18650 2.5A batteries, run a fan, and watch a movie or two if the sun has been out.
EDIT: Cooking we use propane. 20# tank last 2 people 2+months with anal retentive dude always bitchin about "its boiling! Turn down the flame!"