I came across the following thread at JeepForum.com. It discusses options for joining two "loop style" recovery straps together. In the thread is a PDF document, referenced in the second link here, that is a nice, quick what's good what's not so good set of choices.
http://www.jeepforum.com/forum/f27/e...-bone-1303248/
4WD RECOVERY_How to join recovery straps.pdf (3 pages, 257KB)
[PM me for a copy should the link 404]
http://www.tektrek.com.au/images/4WD...y%20straps.pdf