we are driving a class A RV for the first time and towing a car from Ft. Walton Beach, Fl to Santa Rosa, CA starting 09/14/16. We need to be in California by 09/19/16 or 09/20/16 at the latest. Two of us will be sharing the driving so we can make better time. Is it better to take I-10 or I-40? Does I-40 have more mountains and two lane roads? It's fewer miles on I-40 but same drive time as I-10? We are a little nervous because this will be our first RV trip. We are helping our friend move from Fl back to Northern Ca. I think we can just pull into rest stops for a few hours sleep instead of looking for RV camps. Any opinions?