Finally someone joined this little group.
https://www.rv-clubs.us/texas_rv_campgrounds.html
https://www.tpwd.state.tx.us/
Here are a couple links that tell about great camp sites here in Texas.
Really depends on what your looking to do and haw far you want to drive.
Texas being on the big side you have lots of places to go but lots of miles in between.
Just ask any questions you have on the forum.
Youll get planty of answers.