We are just retired (mid 60's) driving a 12 year old suv in very good condition pulling a 6 x 10 cargo trailer. Leaving Sacramento end of June. Wondering route recommenendations. We are not on a speed run but should be in NC by 7-9 or 7-10. Looking at the trip as leisure and site seeing as much as point A to point B. I know the choices are 80, 70, or 40. I have heard that 40 is not very scenic. I am a little concerned about crossing the Rockies with an older car and trailer. Thanks in advance.