I think you're going to get a bunch of people using crockpots for simple stuff- or just hotdogs and hamburgers or sandwhiches if they do eat in. I do.
But also lots, like me, like using the World resturants on vacation, requardless of having a kitchen!
I remember wheedling my DH on our first couple-only trip to WDW (young and poor)- with "I could go home to the tent and grill..but it's raining! We'll get so wet getting home. Let's just grab a chicken plate at Cosmic and people watch..."
Or, "(Big sigh!) Yes, honey, we should go home to FW and eat, but it would be such a better investment of our hard earned vacation money to check out Morroco. It's not like we will ever go there in real life, and look, they're taking walk ins!"
I think if you are organized, freezer cooking works great in the RVs and cabins, assuming if anyone doesn't already cook that way at home from time to time, you practice at least one trial meals run at home with a good guide.
If you are driving and carrying a good icechest, it makes it so simple to pre-cook and freeze stuff like mouseketeer mom said- taco meat, stirfry veggies, sliced chicken, hamburgers, sloppy joe mix, whatever, "freezer cooking style", packed in 1 or 2 gal ziploc bags, frozen in thin hard slabs and stacked in your cooler, then transfered to the cabin freezer.
Iv'e used meals from these cookbooks at the Fort and camping other places, too: Don't Panic, Dinner's in the Freezer: Great Tasting Meals you can Make Ahead. and Fix, Freeae, Feast.
And in the book, Not Your Mother's Make-Ahed and Freeze Cookbook, the author has a sidebar called "taking freezer meals on the road" that just seems like she is talking about a trip to Disney.
But ultimately, cook what you'll not begrudge the time and effort for, and I think most families like thier favorite comfort foods, even on vacation. You know best!