I have fished some in Ellis and some in Hill Counties, and when I asked the landowners for permission to cross their property to access the water, most of them had no problem with it. some you had make sure gates were shut so cattle or other livestock would not escape, almost all ask that any trash created be removed, and so on. The ones that said no, for the most part were civil about it, a few explained why not, and their reasons made sense, for the most part. One lady laid several caveats, including gates, trash removal, etc., and then said if I caught any fish, to bring her some. I not only gave her some fish I even filleted them for her. She was happy and said thanks to me, she and her husband were gonna have a fine fish fry for supper!
If you don't ask, you will never know!