Generally I keep my screw pin shackles in the tool box. But when I'm wheeling and don't want to screw around fishing stuff out of the box (or just want to look like the cool kids) I use black zip ties.
Yep, I use a black zip tie to secure one on the front of my rig as a quick front recovery point (mine is a receiver hitch type, which I have locked on). The others are already attached to each rope/strap I own, since I've noticed that whenever I need a rope or strap I also need a shackle...