Stupid question but obviously when you are riding, you won't let the u-locks hang from the bike frame right? Which means you'll have to install a carrier and put the locks or cables in a bag placed on the carrier. Correct?
People carry U locks in various ways, so it's not a stupid question. Some people put mounting brackets on their bikes or racks. Some put it in their bags, which is what I do. Some hold it onto their bodies with their belts or something similar. I suppose if I could lash it comfortably to my hips, that would help since it's where my center of gravity is, and I have hip mass to spare.