I'm not saying there are never any "delays", but a man named Gary Slider (I believe) operates and maintains the website "handgunlaw.us". This website is the single most accurate and up to date site that I have ever found. And that includes individual state websites maintained by their Attorney General's offices. I do agree, however, that it never hurts to double check as many sites as possible to verify current law in any given state.

Obviously, it is too late for this trip, but my suggestion to the OP is to obtain that Texas license to carry. It would be good in every single state you might happen to go through on this trip, and a significant number of additional states you might see in the future.

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SWCA 3297 SWHF 583