Many years of staying in truck day after day, and looking at used cars for sale and not. I made a rule when I bought my last pickup. No eating, only drink is coffee and water. There is marks on dash from DW's Coke, but still nobody eats. (Few years back wanted to downsize to 1 vehicle. Agreed she could drink her coke, but still can't sell the hamn car!)
On travel days we will pack what we need to fix and enjoy a hot meal just inside the tailgate. Find a place to stop, light the gas grill, chicken or chops, maybe open a can, dump in pan on one side of grill. Sometimes leftovers, or food cooked ahead of time. But no matter we spend some time outside wondering around, eat standing. Also will have mid-morning and mid-afternoon snack, eat outside.