We purchased our first RV 2 years ago as complete newbies, a travel trailer. We also have small kids. One thing I have learned in 2 years is "you don't know what you don't know". For this reason I might encourage you to look for a slightly used unit. Now that we have a dozen or so trips and welcomed kid #3, we have a much better idea of what we should have purchased. However we have not made the upgrade yet due to the loss we will take on our current TT, which we bought new. Not that buying used would mean we wouldn't still be taking a loss, but at least someone else would have shared in the initial depreciation.
Other than that we love the change from hotels to campgrounds, and so do our kids.
2007 Chevy Duramax LMM/Allison
2012 Jay Flight 29QBH
2012 Jay Flight 26BH (Sold)