Having established  the deflection  requirements it may  not be easy to  decide which of the many different  types of  mounting will  be most suited to the application in question. The choice usually depends on whether or not the application is "static" or "mobile" and the preferred method  of fixing.

The use of mountings of different size and type together in the same installation is not recommended as this can induce frequency coupling even when all  the mountings share the same static deflection. 

Generally mountings designed to mount mobile equipment have limit stops incorporated in their design to control the movement resulting  from the dynamic loads occurring during transportation of the equipment from site to site. These stops help to prevent  the mountings from being damaged by excessive stresses and strains and also provide a mechanical interlock should the rubber element fail. 

Where it is intended to  transport equipment attached to flexible mountings which do not incorporate limit stops in their design, care should be taken to ensure that the mountings are not overloaded or the equipment damaged by limiting the movement of the equipment during transit. This can be achieved by the use of suitable packing or strapping, or by the use of transit bolts to lock the equipment to its support.

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