I did some more measuring and research and took some photos of the garage beam structure - The beams ARE glulams!! The upper beam is 5-1/8"w X 17-12"h X 23' total length (20' between supports and 3' cantalever) while the lower beam is 5-18" X 16-12" X 20' between supports (total length is hidden/unknown).
I've found information for newer versions of these type of beams, but since mine are over 15 years old, I'm not sure the data is completely applicable to my particular products. I'm trying to get the exact specifications for my beams from the product manufacturing member association. With a deflection limit of span/360, today's similar products have an uniform load beam capacity of 5100-5900 w, plf (shear controlled) for an 8' span reducing to 800-1000 w, plf (deflection controlled) for a 20' span. I assume w, plf is weight, per linear foot - can any one confirm this and if so, would it be a value in pounds? I've also found lots of other specs, but I can't figure out if/how they apply to my situation. Now all I need to do is figure out how these uniform loads can be adapted to my situation of applying a point load at a specific point in the span.
Here's a pic of the upper beam showing the chain used to hold the chain hoist (note that the upper beam cantalevers 36" beyond the lower beam support and the chain hoist is mounted 10" out on this cantelever. Due to the cantalever and upper wall structure forcing a narrow working width if I was to use verticle support posts, I probably won't use the posts here and will only lift lighter loads that need higher clearances from this position.
A close-up showing the top of the lower beam supporting the upper beam. Also, on the right of the rafter are two more holes where I can move the hoist chain to get it further out into the middle of the garage using the lower beam. I will use 4x4 posts to support the lower beam about 3-4' on either side of the hoist when I use this position. A draw back of this position is the hoist will be 17" lower than the "upper" position which won't allow as much vertical lifting capability.
Here's the hoist mounted from the upper beam. If it was in the lower beam mounting position, it's be about 24" to the right and about 17" lower suspended below the lower garage beam you can see right behind the hoist.
Hopefully I'll hear back from the APA as to the specifics for my older beams.