What I really wanted to talk about is locking up with a rear rack. Usually you can find some kind of sturdy, narrow pole and you're good to go, but some of the bike racks I've encountered don't allow you to get your rear wheel and rack inside to properly lock anything but the front or rear tire, which obviously is no good. I encountered this yesterday and locked up on the end, but was thinking "what if the ends are already occupied" Since cable locks are so easily defeat-able, any good suggestions for alternatives?
Example pic: https://www.theparkcatalog.com/products/zoom/434-6033big.jpg