Hi. Well I am assuming you're just a small scale regular trader, so excuse me if I'm misjudging you, but my answers are based on that assumption.
Yeah, you'd have to store it in your own tank, which you don't have, etc etc. Basically, move past the futures contracts and you have OTC, physical, and wet barrel trading. And this is 'big boy' stuff, which excludes you and I!
Hence the fears from brokers of people holding contracts close to expiry and the increase in margin during that last week.