If you have food in the RV refrigerator then you should and can leave the RV refrigerator on even when traveling down the road.
When traveling down the road the RV refrigerator can safely run on propane and you can also continue using propane or electric when you get to a site with electric.
Or if boondocking you can use the RV refrigerator on propane.
If the RV refrigerator has no food in it then you should shut it off to save propane or electric but keep the RV refrigerator door slightly open.
Things you can stock in your RV kitchen are evaporated milk, powdered milk, rice, canned beans, dried pasta, ramen noodles, jarred pasta sauce, canned tomato sauce, canned tomatoes, canned tuna, canned chicken, coffee creamer and coffee.
Also stock dish soap, dish towels, plates, cups, spoons, forks etc.
You can eat anything in your RV that you would at home.
Foods that are good to eat and have in your RV are Oatmeal, Chocolate Bars, Burritos, Breakfast Burritos, Instant Potatoes, Dark Chocolate, Eggs, Maple Syrup, Milk, Cheese and Crackers, Chicken, Beans, Protein bars, Peanut Butter, Beef Jerky, String Cheese, Granola bars, Granola, Dried Fruit, Cereal, Fruit Popcorn, Trail Mix, Chex Mix and chips and dip.
Good camping dinners are Chipotle grilled chicken tacos or homemade grilled chicken tacos, hamburgers and hot dogs, campfire nachos, shrimp boil, Chickpea curry, sausage breakfast sandwiches, steaks, Quesadillas, Tacos, Dutch Oven Nachos, Foil Packet meals and Salad with Pre Cooked Chicken.
Grilled chicken and mashed potatoes and gravy also make for good camping dinners or even some Chili cooked over a campfire or on your RV stove.
Things you should keep in your RV are toilet paper, sewer kit, sewer hose, drinking water hose, other garden hose for flushing black water tank and sewer hose, leveling blocks, water pressure regulator, chemicals for the RV toilet, electric adapters, surge protector, food and other toiletries such as soap, bath soap, hand soap etc.
You should also stock food that you will eat when camping.
RV toilet paper is not really necessary although RV toilet paper is designed to break down easier in the RV toilet so it won't clog the black water tank like some other toilet paper could.
You can use regular toilet paper in the RV toilet as long as you use single ply toilet paper and not the thicker toilet paper.
If using regular toilet paper in the RV toilet just be sure to not use too much of it and use chemicals in the RV black water tank to help the toilet paper break down easier and faster.
Also be sure to drain the black water tank often so that it does not become clogged.
I've used regular toilet paper in my RV and it has never been an issue.
The RV toilet paper costs more and to me is not worth the extra price.
Never bought RV toilet paper and always have used regular toilet paper that is septic safe.
I just always drain and flush out my RV black water tank before it gets too full and never had any issues doing so.