To start, thank you to all the contributors on this site. The information is extremely helpful.
I will be driving a 26 ft Penske truck from Bethesda, MD to Los Angeles. I have driven this route before and really enjoyed it- taking I40 a majority of the way. I am looking to see if anyone has input on what the flattest route would be- taking I81 to TN or taking I70 and meeting up with the 40 in OK. I am not in a huge rush, but really want to try and avoid inclines if at all possible. I remember a mountainous region in TN which I am trying to avoid. The Penske truck does not take climbs very well!
Any and all suggestions would be appreciated.