Reading the comments again, just about 50% of the time when I see a motorhome going down the road, there's something being towed behind it, maybe it's a a car or light truck, sometimes a boat or even a trailer from time to time. If that's your game, then this isn't the right motorhome for you I'm going to guess. Certainly not if you're going camping up into the mountains or even into some significant hills.
However, the other 50% of the time, there is nothing being towed, so I can imagine either a single or couple, or a family with maybe 1 or 2 kids, could get along just fine in something like the Dolphin motorhome.
I see my dad driving a 38' (or 40', I can't recall) Bounder motorhome with full slides and it's like ... yeah, this is nice, but it's huge and with the diesel pusher it's only getting like 9 mpg diesel.
His looks something like this, except for the bed against the other sidewall and there is a kitchen slide going the other way. It's just huge inside there.