I really wish I could finish it but there are so many variables. My thoughts would center on her habits - her work schedule, etc. If she worked primarily mornings, then I could see a blue collar type (construction, self-employed, etc), perhaps with an (unknown) past violent and/or sexually deviant history, coming in every morning very early for coffee and a doughnut and shooting the breeze with her (or more importantly, shooting the breeze with others about her). He would probably be a rugged, minimally educated, salt of the earth type in his 40s-50s either divorced or single with a history of unstable sexual relationships or domestic violence. Maturity level and IQ are probably low too, and he has a short fuse.
Or, if she worked primarily mid shift or evenings, it could be someone younger (25-35) with a shy and unstable presence - meaning lack of a steady job, unkempt, loner, etc. Any hint of positive attention would get his fantasy narrative going. Think borderline personality disorder - friendly until someone sets him off via rejection or making him feel dumb, etc. May have past run ins with the law but perhaps not of the violent type.
Either way, if I were the police, I would be scanning every credit/debit card purchase over the last few weeks to few months and try to find a corresponding pattern - particularly matching name to DMV photo to car type. He most certainly had to purchase something there at some point, and the likelihood that he always used cash is slim.
All of the above is speculative and IMO, and certainly open to feedback/criticism, and even adding to the hypothesis if you wish.
It was a crime of obsession. He is obsessed with Jessica's type, but not necessarily Jessica herself.
This guy knew he was going to abduct somebody. He did it on HIS terms.
He picked this station due to its location. I think he had checked out other stations and other workers.
Jessica fit his criteria, but so did others. His prior visit was to determine who would be working.
I do not think that he parked for several hours and watched her. Although remote, there are other shops around. He could have been spotted to easily. I also do not agree that he spoke to others about her. He was too cunning to tip his hand.
He came prepared. He knew what he was going to say to get her out of the station. And he knew what he was going to do once she was out of the station.
The most dangerous time, for him, was getting her in his vehicle.
Up to that point, his plan could be aborted. Excuses could be made.
He needed a window of only 3-5 seconds to secure her once she was out of the store.
I think he parked out back, opened up the back of his van, went into the store saying he needed her help. Maybe he said he dropped his keys in the back (of the van) and couldn't reach them, or some such thing. Whatever it was, he knew Jessica would think she only needed a few seconds to help him.
Once she was in the back of the station, he took a quick glance around, saw no one else, and tazed her while she's reaching in the back of his van. He throws her in a box or handcuffs her or otherwise restrains her. She had to be restrained and low to the ground. He didn't want her moving around while he's driving.
Once she's secured, he knew his getaway route. He chose it on purpose. He wanted to see if anyone was following him. Driving a darker, 'not so busy' road would tell him this.
If his age is indeed 30-40, then he has done this before. He knows how to do it, how to get away with it, and where he's going to go once he's done. Criminal history shows this deviant behavior starts at a younger age than 30-40.
Also, he's average to above average intelligence. He can keep his wits about him. I agree that he doesn't have many friends. He's more of a loner. He's probably involved, married, or whatever, but his spouse is meek and he rules the roost without question.
I believe he went out of his way to use cash for his transactions at the station. He knows credit/debit cards can be too easily traced.
He probably knows the area, but may not be from the area. Several have mentioned hunting and I agree that may be what brings him up that direction. Being a trucker would also.