How much time do you have for travel to destination? I can only imagine there are a host of trails available. There are some writeups on Alabama trail systems and new trails that look like stupid good fun. Damn, one of these days I need to hit that area for a trail system fix! Texas has trail systems as well.
You might want to check the various state websites and see if there is any information as well. Chamber of commerce in cities you will be passing through should have information.
Another option is to look into bike shops along your travel route and call em. They usually have the latest info.
It will be a little dated as the last time I was over there was about four years ago. I was suppose to take a week or two long trip last March to do more research and update, but Covid interfered with that.