30' is going to definitely limit any choices able to sleep several kids along with yourselves. In a DP the only one coming to mind is the Tiffin Breeze 28. The shorter lengths will really limit the storage necessary for cross country trips with kids. You might think more along the idea of 34', which will give you more choices. Check the Thor and Tiffin websites for possibilities, along with others. I would be looking at bunk models with the family in mind. You'll save money by going with the gas, but you don't say what your budget is.