Fred,
Over torqued lugs is a common problem on coaches. Truck tire shops use 1 inch impact guns that produce well over 1,000 foot pounds and your wheels should be torqued to 500 foot pounds. Some, but not all truck tire shops have started using a torque wrench to tighten wheels because of legal issues.
I know of at least two BAC owners who have had wheels crack from over torqued lugs, and one coach that broke down one the road because of multiple broken lugs while driving. Also remember, like Karl said the right side lugs are right hand threaded and the left side lugs are left hand threaded on your coach.
Gerald