Big RV family trip--
1. First caculate the number of miles between each place you are going to. Now calculate the total number of miles for your whole trip.
2. Now divide the total number of miles between each place you want to visit and then divide that number by 60mph (average speed you will generally be be able to drive). Thats how many of hours you drive each day.
3. Now divide the total number of miles for your whole trip and divide by 60 and that will tell you how many hours your total trip will take. Now decide how many hours per day you want to drive and that will determine how many days you will driving for your whole trip.
4. Generally speaking most RVers drive between 4 to 6 hrs. per day. Can you drive more hours each day, sure but then you have to consider the effects on you and your family!
5. IMHO, I strongly recommend you make reservations for RV parks for your total trip in advance. Reservations will give you a plan to deviate from, Reservations can always be cancelled and rescheduled.
6. Looking at at your itinerary, some of the places you want to sightsee will be packed with tourist, some of the places are limited as far as RV parks i.e. Yosemite, San Francisco ( I live near S.F. and would never drive an RV there!