Photo of the setup in the dropbox he

http://metalworking.com/dropbox/Stab...Shop_Crane.JPG

I'd still like to make some removeable outriggers for the ends of the
crane's legs, but I haven't run across the right pieces of steel at
the local junk dealer.

If you guys have come up with another way to level and stabilize these
shop cranes, I'd like to see some photos to get other ideas.

You could drill a pair of holes near the casters for a long say 1/2" bolt
and weld a nut on the bottom of the legs. That way you can turn the bolt
down into the ground or boards to stop any movement.
Roger