Right, Taco Bell! I think the one nearest me has no roof, so I'm probably OK. But you remind me that the parking structure at my work has pretty low ceilings and warning beams -- I'll need to be careful when I eventually take my bike to work some day.
simple piece of webbing looped through the triangle
That's a good idea, I should do that, maybe even to replace the rear-wheel strap.
So twixt my OP and now, I took my bike on a 100+mi RT, including freeway and mountain roads, the rack performed like a champ!