Always begs the question:  "why you need a tow rope?"  But we all know SOMEONE will need it.  Best part is, it's almost always NOT the guy that brings the rope.  That's why I always bring one with!  Murphy's Law!  Or something like that.  I'll be surprised if frnash doesn't comment.... He likes Murphy's Law..
Funny story:  Buddy buys a brand new Ski Doo MXZ XRS 800.  First trip out.... Y pipe bolts fall out!  Good thing he stopped or it would have been toast.  But guess who had the tow rope!  Yep, wish I had the camera.  There's me on my Poo pulling the big bad Ski Doo guy!