A bunkhouse is a great way to avoid having to convert the living area couch into a bed for guests or for the kids. It's often also accompanied by an outdoor kitchen in a slideout.
Benefits
Separate area for guests or kids (and their stuff)
Some have a separate entrance directly to a bathroom - great for washing off feet before entering
Built with families in mind, select models include a small bathtub
Considerations
Can have limited storage
Some have a separate entry door, which can be a concern with children