I would suggest, instead of attaching it to "A" truss, you should attach to multiple trusses. Take a 4x4 post or 2" Round Bar stock and span about 4 trusses. You may also want to support your trusses with an additional 2x4 at the point of load. I.E. where the 4x4 ends at the last truss.
Also, the last time I looked into renting an engine hoist, I discovered that is was actually cheaper to just buy one. I found one at Costco, unfortunately, I don't have it anymore. My ex-wife stole it.
I too am looking for an engine hoist at the moment.
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The last living thing on earth will be me. I'll step on the last cockroach.
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