I use a CRL with a microbiner hitched to one end and a trail stick toggle held in place with a cow hitch using loops to tighten the other end (as with the marlin spike hitch, use the knot, not the toggle, to bear the load). I finish off with a double slippery half-hitch on that end.

To attach the tarp to the CRL (which never comes off unless I need to do some maintenance on it), I use the prusik loops with clips that came with my Hennessy. I've detached them from the Hennessy's suspension and retied them as klemheists to the CRL.