Each time it is banged hard or has something heavy dropped on it it looses accuracy. The rolling racks are not for storage of wetware, bisqueware, and glazed ware. They should be emptied of your work soon after it is fired. Every student will have one shelf at the beginning of each semester. When that shelf is full the student may request another shelf.
New shelves are under construction.
There will be ample shelf space. Place short work on short shelves tall work on tall shelves. The more appropriate the work is for the shelves the less likely it is to be moved. If you are going to be building a large piece and need to place it, or a stand for it on the floor and it will be un-movable until it is finished we must discuss where you will do this. Tables should be emptied at the end of class.