What you need is what we call a crawfish setup...
http://www.lalagniappe.com/mall/lobby-boiled-crawfish.htm
or
http://www.copewithit.com/agoracart55/agora.cgi?product=Crawfish_Cooker
Most people around here will set up a 100 quart pot on the weekends on a steel burner hooked to a 20 pound cylinder. They'll fill it with a sack of crawfish (or crabs or shrimp) (50 pounds or so), sausage, potatoes, corn, onions, salt, cayanne (or zataran's crab boil mix), and mushrooms. The stove is more than stable enough to handle it. It would also work fine for frying turkeys...
For what you're doing you could probably run it on disposable cylinders. But this definately doesn't fall into the light weight and compact category!!!
