Last year I had two deep fry pans, large and small, and a crock pot. This year I am leaving the crock pot and bringing a lighter soup pot instead. I can also fry in it if I want.
I like to cook enough for 3-10 days at a time, so 2 large pans will be good. I schedule a cooking day when it's rainy or cold out. I have considered a small saucepan for reheating, but the small fry pan does the job and also works for eggs, etc.
The new ceramic-lined nonstick pans are AWESOME for the RV life!
I have 2 coffee cups in case I have a guest :). And paper and plastic dishes and cutlery for when it's too inconvenient to wash up.
For food prep, 4 bowls (3 was not enough), a bucket, large and small knife, measuring spoons, cutting board... that's all.