Max elevation: 540 ft / 165 m Min elevation: 27 ft / 8 m Elevation change: 513 ft / 156 m
Max grade: 3.1% Min grade: -2% Steepness score: 6 + 307 + 1901 + 8 = 2221
Distance: 239.03 mi / 384.68 km Travel Time: 3 hours 31 mins
It looks like one possible route that might be flatter would be to go through San Antonio, 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 Houston. You can also view a 3-D map of Dallas elevation or Houston 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 Dallas and Houston.