Our family managed to reach the Rockies in Montana, from SE Michigan, on a two-week RV trip in the early 1960s (before there were any Interstates in the middle of the country). That was still about 1000 miles short of any sequoia forests, and a few hundred miles north of the Santa Fe quadrant of New Mexico.
Even on a fly and drive trip, you might need to choose between the Rockies and the sequoias. But if you choose for the sequoias (which are in the coastal mountain ranges) you might be able to see the Sierra Nevada, which I find equally as impressive as most parts of the Rockies south of Canada.
Pike's Peak is about the only place you might be able to drive to the "top" of a mountain in the Rockies, although most visitors choose the funicular railroad.
