Overnight between Terrell TX and Amarillo

We take that route every summer heading to Colorado. Very good highway and not really much traffic. But no notable RV parks past Wichita Falls. Best Western Childress has a few RV sites behind the hotel. A few other small ones along the way. Check rvparkreviews.com for each of the towns of any size. We just go on up to Amarillo before stopping.
Really nice rest areas east of Quanah and another a little west of Childress if you do not need hookups.