I'm not a vehicle recovery expert, but have a lot of rigging, and anchor building experience. For rebar or angle iron "style" anchor I'd tilt back 15 degrees from load. There are several good ways to equalize your anchors for load sharing, however if done improperly, connecting anchors will weaken your system. Another technique that could probably be useful is a deadman (buried) anchor. Deadmen can be incredibly strong. Let me know if I can be of help. Either here, on the phone, or I could probably hike over on friday if needed. Basic 2, 3, & 5 point equalizing systems are pretty easy, but not necessarily intuitive. For load sharing images, google: magic x anchor, 3 point self equalizing anchor, load sharing anchors, etc.