Max elevation: 935 ft / 285 m Min elevation: 9 ft / 3 m Elevation change: 927 ft / 282 m
Max grade: 2% Min grade: -1.6% Steepness score: 10 + 198 + 1712 + 13 = 1933
Distance: 411.16 mi / 661.7 km Travel Time: 6 hours 2 mins
It looks like one possible route that might be flatter would be to go through Houston, 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 Dallas to Corpus Christi. You can also view a 3-D map of Dallas elevation or Corpus Christi elevation.
These are some of the possible highways 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 Dallas and Corpus Christi.