My husband travels for work every week, Monday through Thursday and has for years. I work Friday through Sunday so DD isn't in daycare, but that means DH and I don't see each other much. So essentially, I function as a single mom most of the week and have for almost 4 years. It's not fun, for sure (especially when she was an infant), and I'm a pretty independent person. Being alone a lot wears on you after a while. He's had to miss a lot of the little milestones DD has reached, missed Halloween dress up, the Christmas show at preschool, little stuff I think most parents can take for granted because they are home all of the time.
If my husband could take a job and travel less, I would jump at the chance. The time spent together as a family is far more important than the money, believe me.