are there upsides/downfalls to single-axle TT's?

When you teen goes off to college, remember, they will likely be coming home in the summers, camping may resume unchanged.
Are you more likely to do longer trips without the child along?
Will your type of camp change from "kid friendly" to more boondocking or touring type of travel?
Instead of downsizing you may want more of a couples touring unit that would still offer a fold out couch for the occasional extra family member.