Methinks I10 isn't as bad as some of you are making out. Louisiana has and will always have worst roads than the surrounding states because of the aforementioned graft of the political machine running the place. They make the Mafia look like the Boy Scouts.
But I-10 through Texas isn't that bad. I agree with the Loop 1604 bypass of San Antonio. If that isn't doable, take I410 north rather than I10 through San Antonio. There are confusing spots, but then there are some really good Margaritas in and near the River Walk. There's a bar in the Menger Hotel where Teddy Roosevelt recruited Rough Riders that serves the best. Since you're in an RV you probably won't be staying in one of the haunted rooms of the hotel. Captain Richard King died there and has been seen periodically ever since, just one of the ghosts.
While Kerrville has some nice restaurants, a few miles north Fredericksburg has a bunch, especially German ones. It also has some nice RV parks.
The construction on I-10 on the west side of Houston can be confusing but usually doesn't slow things down--IF you avoid rush hour. I came to work this morning from the RV park in Brookshire at 75-80 mph this morning.
A new Flying J opened in Brookshire October 25th and has the cheapest diesel I've found (ULSD).
It took the advent of casino gambling to make Texans go willingly into Louisiana. Texans, you see, are the natural prey of the unformed Louisiana revenue collectors, ones hired by that corrupt political machine. Violate no traffic laws in Louisiana. If stopped by a revenue collector, tell him you are going to/from a casino. Some years back a Texas highway patrolman was sent to Louisiana to pick up a prisoner. It took us almost a month to get the highway patrolman out of a Louisiana jail, and we never got the prisoner. It's a different world there. I blame it on the habit of eating crawdads.
And those of you complaining about the expansion strips of I-10--Have you ever been near Detroit?