The Job crane really isn’t that heavy however most of my 3-jaw. Chucks weigh almost 100lbs I’m thinking and the 12” 6-jaw weighs more then them and I also have a 18” 4-jaw chuck I think it weighs around 300lbs. Because I can roll it but can’t pick it upHow much more does a chuck weigh than the jib crane? Do you need a gantry with a chainfall to install the hoist to install the chuck?