Legally... you need the title, and take it to a dump. BUT... that has gotten expensive over the years. Locally, it costs me $70, and my time. (use to only be $30)
SO... the last hull I got rid of... I cut it up with a Sawzall, and put it in trash bags. (Keep the hull tag, and the title for future defense) Basically, if the trash guys can pick it up without too much effort, or seeing what it is... they will take it. A good, coarse bi-metal blade (about 8 teeth per inch) will go though the hull like butter, and it will only take about 30~40 minutes to cut it up into 6"~8" hunks. If your trash people are picky... don't try to throw it away all at one time. (do it over a couple weeks)
Last thing... put it in the local CraigsList for $50. You may get someone who needs it. (if it has a clear title)