I'm going to go straight to #6. Think of your trip as if you were going to do it with hotels/motels and a car - would you consider that many places in that amount of time? You're looking at a "7 countries in 10 days" type of trip. You'll be reading the cliff notes rather than reading the book. That is fine if all you want to do is check off a list. But if you really want to enjoy the places you visit, you need more time at each place.
You've got 20 places on your list for a 40 day trip. You'll be driving more than you'll be exploring.
I would consider each planned stop. What exactly do you want to do at each location? Guesstimate that you can do 2 activities per day IF the activities are less than 4 hours in duration. For any activity that takes 4 hours or longer, guesstimate a full day for that one activity all by itself. This will give you time to eat, rest, add in an unexpected activity, and allow for re-arranging if needed.
If you are planning a one-day trip for San Francisco to see Alcatraz, the Redwoods, and the Golden Gate Bridge, you will basically - arrive at Pier 39, walk past all the shops, etc., get on the boat, ride to Alcatraz, take the tour, get on the boat, ride back to Pier 39, get in the RV**, drive over the Golden Gate bridge, stop at Muir Woods, take the short trail through the redwoods, then get back into the RV and head to your campground.
You're missing an awful lot of San Francisco that way. Cable cars, Pier 39, Ghiradhelli Square, Fisherman's Wharf, Lombard Street, Golden Gate Bridge, the Cliff House, and on and on.
Rather than trying to get one big thing at each quickie stop, I'd try more to get an experience out of each longer stop (stopping in fewer places). Maybe have each family member pick their #1 choice, then work out the trip to spend quality time in those places and add additional stops as needed to get from one to the next. Plan for at least 2 nights at any location that is other than "have to stop to rest before driving further".
**You are going to have a difficult time driving/parking a 31ft RV around Pier 39. You don't mention towing a car behind the RV - depending on what car you currently have and what C you buy, they may not be "compatible". That means you might end up having to buy a car that can be towed OR rent a car at all your stops.
1975 American Clipper RV with Dodge 360 (photo in profile)
1998 American Clipper Fold n Roll Folding Trailer
Both born in Morgan Hill, CA to Irv Perch (Daddy of the Aristocrat trailers)