Truck camping often involves conservation of space, water and waste.
I conserve water.
No cooler, which conserves space and the effort to get ice and money for ice.
No paper towels, paper plates or napkins. This conserves waste and money.
I buy shop towels. I buy them at an auto parts store or Walmart or sometimes Dollar General. At first, when they are still white, they get used in cooking or as a wash cloth. When they get stained they go into the laundry bag. If they are still respectable they go back to the cooking area. Once past help at the laundromat they go to the front doors of the truck. Here they do the dirty work (headlight wiping, rear view mirror wiping, dashboard wiping) and they become very ratty. They eventually become unusable and go into the waste bag, which eventually goes to a local landfill.
It takes me at least a year to get through 25 of the handy shop towels.