My feeling is that once these women were dead they were the equivalent of trash to him and he would not have wanted to put a whole lot of effort into getting rid of them. It seems like he just wanted the bodies not to be found, but wasn't even willing to go to great lengths to do conceal them. I would guess he pulled to the shoulder and carried the bodies from there. He seems smart enough not to want to leave any tire tracks on the grass or dirt.
The question is, how far can the average man throw a 120 pound woman? I feel that I could toss a person four feet into vegetation, but I've never tried it. I have a friend who's about 130, but -and I'm only guessing here- I think she'd be quite upset if I picked her up and tossed her.
Was tying them in burlap a way to aid in the effort of throwing the bodies? Could he swing the bag by the drawstrings (if they have any) and get better distance that way? Did it camouflage the bodies and blend in with the brush?
I stumble always over the phone calls to Melissa Barthelmy's sister and Melissa's bf/pimp. See, for the normal sadist 101-type, it would make sense, in a twisted way, to call family, someone who loved Melissa. That would give him an opportunity to torture the family mentally. But why call her pimp? I know, I repeat myself here, but a call to the pimp of a dead escort doesn't offer much chances to torture him mentally.
They both, Terry and Melissa's sister described the caller as an older white dude, most of the time drunk. Okay, you can hear, whether a caller is old, maybe and with a certain risk to be entirely wrong. If it is purely by the voice, a smoker for example sounds easily ten years older. And there is always the chance to disguise the voice. Hey, I can do for example a pretty good Lee Marvin, even singing. So as long as this isn't corroborated by forensic language analysis, for example certain speech patterns or the use of out-of-date terms, I take the part with "old" with a grain of salt. Other parts of the profile would point out about 35-45, but that's also to be enjoyed with care because age is the hardest to estimate part in a profile and bears the highest risks of failure.
Then, the guy was drunk? Okay, how do you hear in a phone call whether someone is drunk? Slurry speech, slower language and missing or changed syllables. This part is interesting. Because a drunk black with education normally sounds pretty much like a drunken white. The more if the being drunk is only faked. Because why would someone who wants to torture someone mentally, be drunk? He wants to enjoy it, he needs his senses together to miss no detail for his later reliving. Unless of course, it wasn't about mental torture at all.
So that leaves us with a guy. That isn't a surprise, we can conclude that from other parts of the profile as well. But the whole torture thing makes no sense. The rare bits and pieces in the media talk about insults of Melissa's life style, the repeated pointing out of what her lifestyle brought her in and threats to the sister if she goes down the same road in the calls made to the sister. The caller basically didn't torture, he did justify his deed. This is mixed with a lot of anger, so it isn't a clear pattern, but visible enough. Too bad, LE holds the transcripts under lock and key, if they were smart enough to get the calls in the first place, which I personally doubt because in the beginning, they didn't care about the missing escort too much at all. And the family doesn't give us more details either.
The interesting part is, what the bf/pimp had to say. There is the name Mickey Mouse (under which also a burner phone was registered). And Mickey Mouse talks about what did Melissa and Terry in bed, what kind of sex they had, what kind of tattoos she and her bf have. Mickey Mouse proved, he was the one who got Melissa. But it's not really torture. Look at the subject, look at the obsession with the details of Melissa's sex life. This feels more like a reliving of a second hand experience.
Why I ride this horse as comment to a post talking about disposal of the victims? It tells us little hints about how he felt about his victims. The unceremoniously dropping right in the bushes would normally indicate, they were objects to him - or trash, as you wrote -, but the phone calls point in another direction. The victim Melissa had a meaning to him, also after she was already dead because I doubt, he kept her that long. And if she had a meaning for him even after death, this is probably also true for the other three. And if you look at each victim alone, they were just thrown into the bushes. But as group, they were carefully spread out over a stretch of roadside, just hidden enough to prevent them from discovery, but not so far away, someone who knows, they are there couldn't catch at least a glimpse at the place in a drive by. So yes, you are right, they were maybe tossed, maybe just rolled into the brambles or maybe really carried in and dropped, but I'm not so sure, they had no meaning to him. I think, he re-visited them a lot of times. At least always somewhere in early June before he went on the hunt for the next.