My first trailer was a 17' hybrid (the kind where the tents pop out of the ends) single axle. Second was a 24' double axle. Honestly there's really no difference in towing. Other than the 24 being easier to back up (less responsive, didn't jackknife as quick). The 24 cut the corners a touch more, but nothing to worry about. Either way you need to pay attention entering parking lots and gas stations.
For myself, even if travelling solo I would absolutely positively require a permanent bed, and a couch. Beyond that, I'm flexible. :B
But generally speaking, larger will give you larger fresh and grey tanks too, which is nice especially on the smaller units that are more likely to be taken to remote areas.
