ZDog, its entirely predictable that your wife was going to push back at the idea of you now returning home- please try to not take it personally. I noted it in an earlier post- as hard as it is for her when you're not there, it's probably easier emotionally for her to be in her own. This is how it goes sometimes.
I agree with the other posters that your current lifestyle could work if your wife were truly on-board and willing to work as a team. I'll bet if you were to ask her, she would say that she IS on-board and IS a team player. I'll bet she feels like she is holding up her end if the deal (and then some!)
For the couples who don't survive a traveling job, the spouses develop independent lives when they are apart. Your wife has a life almost completely separate from you, the vast majority of her waking hours. It's hard, but she has it worked out. This is why I think that it's less comfortable for her when you're there.
The couples who make it work are able to stay connected. I am glad @jld
came on to give some of her thoughts (thanks jld!)
It is very clear that your wife has emotionally detached from you. She isn't interested in spending time with you, even for her "time off" (going to SC). She is probably one of the people who need to be around their partner in order to feel connected. Skype is not a workable solution for people like this- and IMO, that's the majority of people. She is still getting up every morning and she is responsible for everything except making money. She is the immediate problem-solver, the daily architect, the person who does all the hands-on care and all that entails on a day-to-day basis. She is on her own.
She has found a way to do her job, to pull her weight, without you at home. She can't rely on you to help her simply because you're not there. So she doesn't rely on you. But that means, she doesn't rely on you, you see? She can't afford to need you, simply because you're not home. But this means, she doesn't need you. She has her own independent life, which she can handle just fine on her own. You make the money, she does everything else. You do your part, she does hers, but you do them independently. She has closed herself off from you.
Skype and phone calls don't help the spouse who wakes up and goes to bed alone, who lacks daily hugs, kisses, intimate conversation in the kitchen, who can cover the kids for a moment while s/he takes a shower, runs out for an errand, etc. This is the "daily bread" so to speak that nourishes most marriages. Emotional needs can be met on a daily basis when both people are home.
It is true of course that she might have closed herself off to you even if you had always worked at home. But I am not sure that's at all relevant. You're here now, and the fact is that a sh!t-ton of couples end up where you are, when one spouse travels very heavily for work.
I don't think that it's your fault that your marriage is at a low point. I think you both went forward thinking that it was the best path for your family.
My recommendation, for what it's worth, is to go do some reading here, about the three states of marriage: Three States of Mind in Marriage
From your posts, it looks to me like your wife is in withdrawal. This is a dangerous place, because there is low or no conflict going on when one of the spouses are in withdrawal. They've just given up on being able to rely on their partner emotionally. They start getting fiesty again when their partner starts to meet emotional needs- it drags the withdrawn one into conflict. The withdrawn spouse will fight back, s/he is angry that the other spouse is screwing with their "safe" withdrawn status (and says things like, "you can't handle these kids! You can come home, but I'm getting a night shift job. And btw I'm using your air points so I can get my down time without you in it!") But, it is very, very difficult to resist getting ones emotional needs met. This is the conflict- anger, but reluctantly, eventually, they go with it and then, they find themselves back into intimacy.
If you can get your wife back into intimacy while you maintain your travel job, then you will have solved your problem and kudos! Please share it, because I'd love to have the knowledge to share with the people who struggle with the same problem in my work. But I think your best bet is to get home. I thinks it's the best thing for your marriage, and pragmatically speaking, it's probably best if you divorce. You'd be a able to get meaningful custody and your wife would already be working. You can always find a traveling job, it's there if you wanted to go back. Can't say the same for your marriage though.