I carry a light inexpensive ski rope in the sled all the time. Doesn't take up much room, 75' of line and a throwing handle for someone to get a grip on.
H&C here's the link & contact info for EZ-Steer. Hope it help's you out:
http://ezsteer.com/pages/EZSteerHome/
http://marinetechproducts.com/pages/ContactUs