lug bolts

I'm interested in knowing if anyone else has had the rear lug bolts back out. Probably should have checked more often but I had a couple back out on me. I changed the wheel with just the tool kit (I don't carry a torque wrench) and felt that they were tight but a thousand miles later ...

A fellow BMW owner sent me the following link on lug bolts, but I can't open it. I get a message that says I do not have sufficient privileges to access this page. http://forums.bmwmoa.org/showthread.php?t=3D33419 What am I doing wrong and IS there a problem with the lug bolts on my 2007 R1200GS?