Indirect heat with side firebox
Looks like you and I have the same grill. I picked mine up at Lowe's last year and this spring I finally got around to putting on the side firebox (it's about 40 bucks extra).
Anyway, I wish I'd done that a year ago. You can load up the whole grill with butts, sausage, ribs, etc. and still get that great indirect heat and smoke. Wonderful stuff.