I can likely get by with one sharp knife. I don't really need to carry more for RV camping than I carried for camping out of the trunk of a compact car. Even looking at it that way, I often find when unpacking after the trip that I didn't use half of what I brought. I'm working with that to refine my packing lists.
The real problem is all the extra stuff I have to carry to take care of the RV, tools and parts for "just in case." The things you would not use if just camping, like hoses and cords for hookups, and the things you hope you'll never have to use.