A piece of 8" I beam supported at both ends by some 3" diameter pipe will carry any load that hoist is able to lift, while putting zero load on the structure of the building. If the beam stretches the width of the shop, the trolley will allow a pretty good bit of travel. I've got a system like that planned for my next shop upgrade, using a hoist my father had in his shop in the early 1950's.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!