I have had an anchoring system for cruising around New England...cape cod to Maine...so I could sail the boat somewhere, leave it at anchor, come home and go back in a week or two and feel confident that it was secure and still there. It is as follows: I have a Bruce 22 and a Danforth. The Bruce has 20 feet of chain (on the bow) followed by 50 feet of 3 strand, follwed by a swivel where you can connect the Danforth with 30 feet of rode. When I leave the boat unattended, I hook the Danforth rode to the swivel. After that swivel, I have another 30 feet of chain (that acts like catenary) followed by 100 feet of 3 strand. Believe me, the boat is not going anywhere once set. It's almost as secure as a mooring. The swivel prevents twisting, etc.
Anyway, hope this helps.