Where are you starting and ending? How old are the kids? Does the family like to hike? Make sure that you do not plan such an ambitious agenda that you spend all the time on the road.
First two weeks of August is blackberry season in the Northwest -- save time for fresh picked berries on rich vanilla ice cream -- the kids will never forget it. Grab some cheap gloves at Harbor Freight for the thorns.
If Sequoia is not too far out of the way, there is very cool camping at Azalea campground (6500 feet) -- no hookups, though. How big is the RV? Can you boondock?
