Originally Posted by Michael
I bought the Kyrptonite anchor. Haven't installed it yet but it looks pretty secure. For your purposes you could dig a hole, pour a couple of bags of redimix cement in, and attach the ground anchor to that.
Here is another option I found on the Net. http://www.bikeradar.com/gear/catego...ackle-10-34370
This site also has reviews of several ground anchors.
aaand here is something pretty cool - a 40" long spike you hammer into the ground - they post a video of a jeep trying unsuccessfully to pull it out. http://www.memphismetalfabrication.c...ndanchors.html
When you install it, follow the instructions exactly. It's important to use the anchor as a drill jig so all of the holes line up when done. The drill bit tends to walk when starting, and needs the next hole in the anchor to guide it.