Yes the place and way she was found strongly point toward a trucker.Well, no, but there are a few additional clues that point towards a trucker.
First, she was thrown out immediately after leaving Huntsville. This means that her killer wanted to get rid of her as quickly as possible and did not bother to carry her body across state lines, for example, to confuse the police. But it also means that he committed the murder near where the body was found. I think Carl Koppelman pointed out somewhere that it's hard to believe that she was killed, say, somewhere near Ellis Prison, and then having her killer driving all the way back to Hunstville, onto the interstate and then placing her body on that relatively busy road. It makes no sense.
Second, her body was placed right by the road, where it would be quickly discovered after sunrise (which it was). This means that her killer had no intention of hiding her well. This is especially important since Huntsville is surrounded by large, undeveloped areas, where it would be easy to hide her in a way that she would never be found. Someone local would have both the means and the incentive to do so. But her killer didn't care. His plan to get away with murder was to literally get away. He knew that by the time she was found, he would be far, far away.
Thus, both pieces of circumstantial evidence indicate that the murder was committed nearby (i.e., at the truck stop) and that the murderer was a transient who would most likely never return to the city.