Easy/lazy cooking ideas

Is there any way to cook food that I can cleanup without having to get out of the truck? Washing in the cold sucks. Been using a ninja griddle which yes it works but have to wash it every time I use it. Microwave foods are fine but was also looking to cook stuff too. Like I can use disposable sheets for an air fryer or something? Got a fridge and 2k watt inverter. Thanks for any ideas.