About 35 years ago, I took a 30 gallon barrel and cut an opening in the side.. Then cut a round piece of 3/4" plywood to fit into the top lip and secured it with a few carriage bolts..
Painted it blue, let the paint dry, bolted the drill press on top and filled the barrel with a bunch on rocks.. That ****** stays put when in use... To move it, I just tilt it a little and moves like any other barrel... Drill press is a top heavy item; I like the weight on the bottom.....
My Columbia 4" vise is mounted on a 15 gallon barrel in the same manner, only with a rectangular steel plate welded to the barrel top..
Rather than rocks, the barrels can be used to hold those extra pieces of iron and steel that are so often saved under the workbench..