I think we're going to move from our fifth wheel bunkhouse trailer to a toy hauler at some point.  Bringing toys and "stuff" along now is challenging because so much of the bed is tied up with the hitch, trailer and a large kennel for our dog, and the cargo space in the trailer is limited.  
A toy hauler really helps mitigate the cargo carrying issue.  We also generally prefer to dry camp and the larger tanks and on-board (gas powered) generator would make it a more comfortable experience.  
We aren't 100% yet and for now our current camper works fine, but it's something we're thinking about seriously in the next few years.