Anchor trolly is a good start. Understanding how to use it safely is essential. Here's a quick video that explains how to rig for quick release. PLEASE, for the sake of safety understand how this works. http://www.youtube.com/watch?v=WglOaACZe1E
Also, I would suggest you always keep a sharp knife (like a small dive knife) on your person at all times. With that much line in the water, tangling is a real possibility. Attaching that knife to your PFD is a good idea. Of course, that is contingent on actually wearing your PFD all the time, which is also a good idea.