There are three (arguably) groups of victims jmho. There are those who were killed on site and left at the same site (Cathy Millican, Lynda Moore, 1978 and 1986 respectively). I believe there was an element of stalking/"hunting" of a kind with these killings in that the killer may have surveilled the victims before the murders and followed them to the CS.
There are the victims who were hitchhiking, so Bernice Courtemanche (1981), Mary Critchley (1981), and Eva Morse (1985). The remains of all these victims were found in the Newport area.
There is the group of victims who had vehicles of their own: Ellen Fried (1984), Barbara Agnew (1987) and the woman who escaped, Jane Boroski (1988). Ellen Fried had been on the payphone at Leo's with car recovered on Jarvis in Claremont, Ellen Fried's remains were recovered in Kellyville. Barbara Agnew was up skiing in Stratton, VT en route to home in Norwich, remains recovered in Hartford, VT. Jane Boroski escaped at the convenience store in West Swanzey.
I am guessing these are different killers. I think there are up to four, but there are at least 2. If I had to guess for one person for all these crimes, with all these somewhat diverse locations, and some of the crimes occurring on weekdays, some occurring on weekends in the summer, I would guess a shift worker of some kind, or someone with seasonal work. What about someone who worked at (or was in some way associated with) the centrally located (in terms of the murders) place like a ski resort/lodge, which is fairly close? Someone who at the time would be both living and working in the area. With that said, though, I am guessing that this may well be multiple killers, two to four of them. The only thing that makes me second-guess on this a lot is the idea that I saw something at one source mentioning a distinctive pattern/shape knife wound that may be common to multiple victims. I only saw that in one source, though, I believe. Also, another thing I've always seen is that SKs very seldom "bury in their own backyard," so it's more likely they'd leave some distance from the location where they actually live. (More likely, but not definite.)
There's no way I believe RH could do all of these, so let me emphasize again, just wondering about RH with Lynda Moore's case. And I'm not saying by any stretch "it is." I'm simply mulling over some things I've seen, and not yet completely dismissing it, MOO.