I've contended with similar. Some ideas here...
http://forums.pelicanparts.com/porsche-911-technical-forum/1123185-tow-strap-recommendations-front-911-a.html
Also, we used Rhino Inc. tie down straps for the recent 2,500 mile trailer roundtrip to / from the Hill Country Rallye. I don't have a picture of it, but this "double width" hook locked into the front a-arm torsion bar receptacle openings in such a way that the strap angle was as low as possible. An unexpected feature as a result of the opening being oblong as opposed to circular.
