I removed the support beams you are talking about so you could see the rest of the structure
Not sure what you mean here. Look at the post that holds up the end of the parallel truss. The beam that post is sitting on will bend in the middle. That's a potential weak spot in your design.
I just don't know how to calc load on a parallel truss
So we're back to my original advice, which is to seek professional help. The stakes are high! CB.
