First saw the washing machine drum fire pit at a rally in Texas several years ago. It was mounted on a collapsible three-legged stand.
If using the metal firepits at a lot of campgrounds, put a rock under one or more sides to create a space between the metal and the ground. This will allow the fire to draw air. (I think someone has already suggested that)
If you are still having trouble, just find your nearest Native American and we'll gladly help our out paleface brethren. (or otherface brethren) We have lots of experience.
GM