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I will try answering your questions in the order you are asking them:
1. Actually, you need the straight pin through a pair of holes. If you can not do that, use 4 pins - all holes attached in reality should be attached in model too.
2. Load of 100 lbs per entity * 3 entities = exactly 300 lbs.
I agree with Basil. Regards the first question about fixed or immovable - the question I believe you're asking is "Should the ends be allowed to pivot?". A "least-stiff", and perhaps conservative approach would be to allow the ends to pivot. You'll see the most deflection in the structure with the ends allowed to pivot. You can do that with a "Hinge" restraint. The question regarding "fixed" or "immovable" comes into play when you're using shell elements, and is a local phenomenon. For solid elements, "fixed" and "immovable" mean the same thing - nodes cannot move. For shell elements, the term "fixed" means all nodes are prevented translation AND rotation. The term "immovable" on a shell element means only translation is restrained, but nodes are allowed to rotate individually. This issue arises because solid element nodes only have three degrees of freedom - in translation. However, shell element nodes have six degrees of freedom. Each node on a shell element can rotate about three axes and translate along each axis. I hope this helps. Regards, Anthony Botting