We started the Prevost lifestyle when our sons were 6 months old and 3 years old. They have been to 48 states and 3 Canadian provinces in the bus. We started with a 40 foot XL with the boys sleeping on the two couches up front. After 5 years we moved to an XLII with two bunk beds. We had that bus for 12 years. The bunk coach was a great improvement over the first bus with the bunks and the ability to be in the living area without having to move the boys off the couches. By the time we purchased our current bus, the boys were in high school and college and had stopped traveling with us. Traveling by bus was great with the boys. It was exponentially easier than trying to get to young kids through an airport and to sit still on a long plane ride. If you have four kids, I would look at an entertainer type coach that has six bunks (one for mom and dad as well) and a rear lounge and a front lounge so there is more space for them to live on the road.