Max elevation: 1762 ft / 537 m Min elevation: -33 ft / -10 m Elevation change: 1795 ft / 547 m
Max grade: 3.5% Min grade: -5.3% Steepness score: 18 + 528 + 3116 + 9 = 3670
Distance: 268.23 mi / 431.67 km Travel Time: 4 hours 9 mins
It looks like one possible route that might be flatter would be to go through Fortuna Foothills, but make sure you double check everything if you're planning a road trip.
Elevation data comes from different sources and may not reflect true
driving conditions, so talk to other RVers if you're concerned about
steep grades. If you're planning to drive in the winter and you want to avoid snow, check the road conditions from Phoenix to Palm Springs. You can also view a 3-D map of Phoenix elevation or Palm Springs elevation.
These are some of the possible roads along this route. Use the GPS in your car to verify all driving directions. If you're looking campgrounds along the way, search for RV parks between Phoenix and Palm Springs.