Move the kids when they will have less trauma of leaving friends and the change less likely to have an effect on them.
If the area where you want to move closer to the job is kid friendly and school district friendly, then consider making the move.
If the commute is the problem and your hubby has a decent job already, then maybe he can carpool or something else. Otherwise, it might just be one of those sacrifices either of you have to make.
Uproot the entire family and all be miserable or one person be miserable and have a good job to finance all the family. It could also work out for your good if you get both a closer place that is kid friendly. Then everyone wins. Only you can determine what is best.