It'd be worth looking for additional items that need to be addressed that could be causing extra strain on your motor mounts.
For example on my vehicle, there are the two front motor mounts underneath the engine. Then there is a third one that depending on who you talk to will call it a rear motor mount, transmission mount or transmission isolator.
Since the engine and transmission are hard mounted to each other, if this rear mount was bad, it could cause additional movement and stress on the front two.
If your suspension needs new shocks, bushings, etc you are going to have more movement in the vehicle and then items such as @xpda mentioned of rail road tracks are going to transfer into the wrong places, potentially your motor mounts.