I am planning for a new workbench in my shop to replace my old one.It will be approximately 36" x 80",all drawers facing from both directions (basically 18" deep drawer bases back to back),they will all be full of various tools.I need to make it mobile because it sits in front of an overhead door,and needs to be moved when material shows up.I have not had much luck over the years with locking casters,probably because I have never bought good ones,I usually just bought them from local hardware stores.The locking mechanisms alway's gave me fits after a while.Hopefully I can get some recommendations on some quality casters,I dont mind spending the extra cash on them if it makes my life easier.I am even open to the idea of not using locking casters,but using non locking casters,if there is another way to keep it in place when I dont want it to move,but could easily be made mobile again?Also,what would be an appropriate size,6"? Any input would be appreciated.