I can see where you are coming from....the sidestay is doing the heavy lifting. But then again, so isn't the mainsheet also lifting the beam. So, the bolts are sized for the beam torque, not the weight of the guys standing at the back of the bus?

Is the composite structure at the sidestay that much superior to the structure at the beam landings? Some mode conversion here I guess. The sidestay is in shear, while the beams are compression/tension.

Hanging off the beams while trailering would put the beam bolts in tension, while the normal mode is compression. So, the nuts are at risk of pulling through?

Just trying to get my head around it.