You may not want to spend the money, but as stated above, Microsoft Streets and Trips does what you want. For some reason, Microsoft decided to quit producing the software, but you can still buy copies on Ebay
Streets and TripsEven older versions still work well. You can set the start/stop time, miles per day, speed, how often to stop for a break, your fuel economy and gas prices. Once you enter the point A to B stops, it will calculate it all for you. You can even print out a hard copy of the route, or save it on the computer for future use.
We've been using it for years. If you highlight your end point, you can search, by a radius you determine, for campgrounds in the area. As stated above, we then go to RV Park Reviews and check out the campgrounds. When we're on the road in a new area, we do the above search the evening before, identify two campgrounds and then the next day we call ahead for availability.
Don & Mary
2019 Newmar Dutch Star 4018 - All Electric
2019 Ford Raptor Crew Cab