M_Boats: Pulling a large kayak with an M15

I'm wondering how much the sailing characteristics of an M15 would be degraded by pulling a 12' 6" kayak. I have a Hobie Outback which is just 2' 6" shorter than the Monty. Has anyone experienced pulling anything this large? The Outback weighs 64 lbs. The good part about this kayak is that with it's Mirage drive system (peddle power) it can tow the Monty. I was going to sell it for something smaller but thought I would get some opinions on it first. This is what the kayak looks like: http://www.yourcommunityweb.com/kayak.htm . Norm M15 #172