@Patrick *********
The TM30 tells the immigration office where you're staying. It must be filed no later then 24 business hours after you start staying the night in a different location. *SOME* immigration offices only want this file once you arrived in Thailand.
The TM28 tells the immigration office that you moved permanently to a new location. This must be filed after you moved. The large majority of immigration offices no longer want this filed.
*ASK* your local immigration office what their policies are for the TM30 and TM28.