as our old RV (and us) don't like crossing mountains... what is the lowest altitude going from the west coast to the east coast across the mountains. i was told that I10 is flat but elpaso is 4000 f...
Depends on your starting point...I10 no real issues other than the no name grade just east of Indio...I 40 is a breeze if you use Bakersfield to Barstow and catch I40 there. As for anything big their are just rollers from that point on.