Max elevation: 4921 ft / 1500 m Min elevation: 2362 ft / 720 m Elevation change: 2559 ft / 780 m
Max grade: 3.1% Min grade: -3.6% Steepness score: 74 + 360 + 2784 + 10 = 3228
Distance: 317.54 mi / 511.03 km Travel Time: 4 hours 36 mins
It looks like one possible route that might be flatter would be to go through Marfa (Texas), 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 Tucson to El Paso. You can also view a 3-D map of Tucson elevation or El Paso 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 for campgrounds along the way, search for RV parks between Tucson and El Paso.