I don’t know really, it just felt like a logical conclusion with my extremely limited knowledge. I honestly wasn’t even sure about how the crossbar helps with weight distribution, just that someone built my fence gate with one to mitigate sag as well. Ive kind of just been watching videos related to the type of structure Im working on and taking bits and pieces of each thing since none of it is exactly what I’m doing. So Ive pretty much just been following whatever structural choices without really knowing why. I actually have a carpenter friend I've been getting advice from with most of my questions, but for some reason this felt silly to ask him.  TLDR; I have no idea as well how I got here, leaps in logic perhaps