Get two or three of those D-shackles. You should be able to rig something up with them most of the time.
X2, unless one of the rigs involved has tow hooks (or built in shackles,) you'll need at least 1 D-ring. If you're already going with a 6" strap, adding a few d-rings won't take up much more space, and will allow you to attach to just about anything.