Thanks for all the advice.
I know many think a family of 6 in a small RV would be a disaster, but I assure you we will be just fine. We don't all have the same living space requirements/desires - see the tiny house movement for proof of that!
I am going to start looking for an older unit that is perhaps in better condition, lower miles. Then I'll have a good cushion to do some remodeling/upgrading/repairing as needed. I am a handy guy who does most of my own everything. Does that sound like a reasonable plan?
What are the features that an older coach will not have that I would want to add? What features will a newer coach have that are difficult/impossible to add?