On a recent trip to and from Florida we drove IH-10 for about 70% of the trip. One thing we noticed was the amount of semis on the roads. There were more big rigs than we have experienced in a long time. Portions of 10 have very poor conditions, especially in parts of Louisiana. Coming from the West on 10 you will have to go through the terrible traffic in El Paso and Houston. Here in San Antonio it is not bad if you transit before or after rush hour. The east side of the Mississippi River Bridge is fun too for a few miles.
I never drive more than 62, usually 60 - 61 with toad so they can all fly by me. I do not care how far behind me traffic might back up. I am only concerned about the safe operation of my RV by me. Will you ever see any of those people again? I doubt it. Remember, the right lane is the RVer's friend. Any professional RV driving instructor, as I used to be, will teach that to you.