I have the same time problem:
Demanding job 65 miles from home
Home with 6 young children
Multiple projects
Limited funds
I think you are doing well with 6 kids. I have two and that is plenty. At least we can all fit in the 500. Though I do dream of the day when we can drive in convoy with the 500, 850 and 1500. At 9 and 7 there's still a few years until they get their licence but not too long,