For many things, you can pre-make or pre-prep parts at home. Pasta sauce, chili, soups, etc, are all great things to pre-make. Then just heat up on the stovetop.
You can look for "10 ingredients or less" cookbooks.
Otherwise, go for basic foods combined for meals. Soup and salad. Meat and vegetables. And so on.
1975 American Clipper RV with Dodge 360 (photo in profile)
1998 American Clipper Fold n Roll Folding Trailer
Both born in Morgan Hill, CA to Irv Perch (Daddy of the Aristocrat trailers)