I've heard good and bad things about flat plate gussets and I generally don't have an opinion either way. If a customer wants me to add flat plate gussets to a cage I build I'm happy to do it, but they need to specify where they want them. I generally avoid putting a gusset inside the plane of the joint (between the joint tubes) because a bridge building engineer friend of mine said that creates a point load on the tube at the tip of each gusset. He suggested placing the gusset on the outside of the joint along the centerlines of the two tubes making up the joint.
I do install short diagonal tube lengths to reinforce the upper door hoops and other long span upper cage elements. I also like and use Joe's wrap around tube gussets.
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