I'm planning similar to how I used to prepare for a trip when we went RVing.
I'll have a food suitcase which will contain rice cakes, GF cereal, soup broth, potatoes, potato chips, sunflower butter, Ener-G egg replacer, canned chicken, pre-cooked rice, canned tomatoes, tuna, GF pasta, fruit cups and fruit juice and my recipe box.
My cooler will contain homemade hamburger buns and bread, mayonnaise, mustard, catsup, Ghee, margarine, jelly, pre-cooked bacon, packaged chicken sausage, hamburger patties, chocolate, waffles, almond milk in 8 oz. plastic containers, soda pop (for DH), relish, and steak sauce.
I have one suitcase which will contain two electric burner plates, a small microwave and a toaster oven. I'm packing dishes, storage bowls and cooking, baking and eating utensils along with cleaning items.
In addition, I've looked up the chain restaurants along the route where I've safely eaten which offer GF menus . I am planning on preparing my own breakfast and lunch, but eating dinners out. Hopefully that will placate DH.

We're leaving Sunday morning and hopefully returning Saturday, if all goes well.
If you can think of anything I've forgotten, please let me know. Maybe I should mark all the rest stops on the map.

Gloria