This is how I set my traps up. It's not he only way, just the way I do it. This makes them versatile and you can switch between several anchoring systems.
This a pic of the setup. There's several inches of stock chain from the MB 550 with a stock crunch proof swivel. I then add a inline JC Conner shock spring. Mine required welding the rings but now they make newer ones that are weld free. The shock springs were required by law in NC, but I like them anyway because they make it much more difficult for a coyote to pull a stake, damage a trap, or hurt itself. After the shock spring I add another crunch proof swivel. Then I add a JC conner double stake ring. On this particular trap I have a split ring connecting the double stake ring to an MB chain stake. You can also use s hooks or quick links. Quick links are the easiest. The chain stakes are made by the same folks that make the 550. They have welded a super stake to American #2 chain with an s hook. It's easy to drive and will HOLD. The driver only cost $7 each.
Here's a close up showing the shock spring, double stake ring and the split ring.
What's versatile about this set up is I can easily remove the chain stake from the split ring and switch in a drag. I use JC conner drags on 8-10' of #3 chain with a couple of in line crunch proof swivels. There are times when a drag is much better than a solid anchor.
Or, I can remove the quick link and run a couple of rebar stakes at an angle through the double ring:
J C Conner springs, rings and drags can be bought at his website here. I also recommend his badger digging tool for digging trap beds and holes:
http://www.jcconner.com/tbar.html
Like MB, he makes top notch quality equipment and traps.