[Marlin .45 carbine]

smaller ones can be split long ways and placed on a grate over a split oil drum. use the other half of drum as a 'lid'. a welder could hinge the lid.
cook it with the hardwood and charcoals in the corners, just alittle fire underneath the pig. yummy. I've seen kids pull a wild/feral pig apart when we layed it on picnic table