I found Texas to be a fine place to tour other than the fact that I found the scenery pretty uninspiring for the most part. The food and the people were great. That is all true of most of the Southern Tier though.
I actually saw very few cops in Texas other than border patrol, but the ones I did meet were nice enough. Border patrol never bothered me either despite my wild camping in plain sight. The young guy who I rode with some of the time did attract more attention from the border patrol, probably because he is young and looks like he could be Hispanic. They didn't really bother him much though. They just stopped a few times and asked him where he was from and where he was going. I don't think they ever even asked him for ID and they never delayed him more than a minute of so.