MikeV99 wrote:
… We are thinking about a 25' Class C without a toad….. Would it be unreasonable to unhook everything to go to a restaurant or maybe go sightseeing and then hook back up upon return? … .
I've done exactly what you plan to do, and I found it perfectly do-able. A smallish Class C can find a place to park in most parking lots (stores, restaurants, etc.) or even park on the street. I used mine as my suburban daily driver for a year!
You won't have to "un-hook everything" if you don't hook up everything in the first place. Your RV will come with tanks for fresh water as well as waste: To stay mobile, use those and only "hook up" for a few minutes to fill or empty as needed, every few days. Just plug in the electric, and maybe not even that for an overnight. Enjoy!