It's a secondhand smoker that sits on a trailer. The firebox is in the back. It has a blower to increase air flow to the cooking area. My problem is when I try to smoke chickens, today I started at 11am and at 5 pm they were still not done. I have the fire blazing in the box but I can't seem to get these darn things to cook. Any ideas on what I could be doing wrong? I am using oak firewood with some mesquite thrown in for flavor. The chickens are brined.