I've pulled tubes with an 11' Metzler and a 4 hp.
It's a peaceful ride. The kids weren't that thrilled.
Saw this in RI this last summer. The family looked as though they were having a blast. I think this was there dingy for a much larger/expensive boat.
Wait... how the hell do i attach an image? these forums make things so damn confusing... not link or url... but if have it on my desktop
Anyway, its one of those small 12' rafts with i think a 20hp on it.