Meanwhile, our Duo trailer has had two of these bolts
fail in the last week; one of my partners just showed
up and left a broken bolt on my desk.

Has anyone used NAS shear bolts as replacements? They're designed for
close fit, and have ~160-180,000psi in tensile and ~95,000psi in
shear (+CAD II plating...) 'normal' bolts are as low as around
50,000psi in tensile and not even rated in shear.

http://www.aircraftspruce.com/pdf/20...l/Cat11065.pdf

-paul