I havn't used chunks for years. I have an 09 and an 055. Pellets offer a much better choice of flavors and clean up is a snap. I tried Treager early on but found
http://www.bbqrsdelight.com/ to be much better, IMO. Call Candy Sue, she is most helpful.
I make a foil pouch and leave the top open a bit. When I'm done, I just throw the whole thing in the trash.
Good luck