Leave the long dresses and high heals at home.
Well, George, usually. I carried dressy clothes on three or four different trips and laughed about carrying both camping clothes and cocktail dresses. The exceptions are if you plan to take a cruise at some point in the RVing journey and want to have nice clothes for Captain's Night, if you'll be attending class reunions and will be attending cocktail parties, or if you'll be going to a wedding. All require clothing that is better than what we normally wear. Oh yes, when we had several aged family members in poor health, I also carried an appropriate black dress and shoes so I could get on an airplane at the nearest airport. That paid off on one occasion. It's not fun to contemplate such negative events, but better to be prepared if you know it's a possiblity.
We like the crock pot for driving days. I put it on in the morning (fits in the sink for safety) and by the time we arrive at our evening stop we have a nice dinner. And, boy, does the motorhome smell good!
What you take really depends a lot on the kind of RV you have, how big it is which dictates how much you can carry, and what you think you'll be doing along the way. For example, we both always take our laptops. On longer trips you need to be prepapred for a variety of weather. If we leave in April we can encounter snow in the mountains and beautiful sunshine in other places. Betty's advice to do layering is good. We often start out wearing winter clothes and return in the heat of summer, so I always take more clothes than I need, much to Jerry's dismay! I usually wear most things at least once, but sometimes plans change along the way and maybe the weather is quite different from what I expected so my clothing needs changed.
Tools, GPS, special foods, maps, special books for flower or bird identification, campground guides, FRS radios if you're with a group, binoculars, DVDs, umbrellas and rain jackets, maybe rain boots or something in case you get into mud, tools, tire pressure monitoring system if you have a toad, reading materials, laptop, small printer, scanner, camera, address book, stamps for postcards and mailing labels, special medical things like a heating pad or a blood pressure monitor, ad infinitum. I have a list that takes two columns on one page. I don't take everything on every trip, but my list reminds me to at least consider an item. Hmmm, my list does not have cocktail dresses....
ArdraF