First, kudos on going through the Dave Ramsey course. Second, kudos on taking his advice seriously.
Based on my experience RV's are typically not up to full-time living with kids. Kids are going to be kids and will push the construction quality of an RV to it's limits and beyond. Running, jumping, slamming doors, banging into walls, etc. and the normal, everyday type of wear and tear that are tough on a regular home will be especially tough on an RV. There may be some manufacturers/models that are more robust but I'm not familiar with them.
Beyond that the outdoor environment may not be very conducive for raising children. Are there other families with children in the RV park? Are there places to play for the kids that will be safe and secure? I'm guessing you've already looked into schooling and transportation to/from school.
These are some of the things that come to my mind when considering your situation in addition to how long you're going to need to live in these circumstances until you'll be out of debt and to the point where you'd consider going back to traditional living arrangement. If it's one or two years maybe it's something to tough out and get it done. If it's five or ten years that makes the decision quite a bit tougher.
That said I'm hoping for all the best to you and your family.