what you are looking for is a jib crane, they come in two basic styles. some are free standing and involve a lot of concrete work. others can be fastened to a verticle element of a structure. they can be fastened directly to a col in your barn if the col is capable of handleing the load. otherwise they come with thier own col but still rely on the barn for lateral support. a simpler method is to run a mono rail down the center of a bay through the exterior wall above a door this requires barn style doors not overheads and also relys on the structural integrity of the structure.you would need an s beam not awide flange as most trolleys are desighned for standard beams only.

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