Theres not really a huge chance of the sissy bar failing. Its not pretty, but its thick steel and really hard to bend. I have a feeling that any kind of force that would hurt the sissy bar would have already exploded my ass into tiny pieces. Maybe I could get a long bolt or a QR skewer to put between those holes for extra strength.

I'd also feel kind of bad hurting the frame. Its a part of bmx history!