This is not a guaranteed solution, but adding the motion given from a rocker plate may reduce the stress from a rigid trainer on the dropouts and rear section of the frame.
This shows the relative freedom, and I feel that it reduces the side loads that can happen when we connect the frame to a fixed trainer, and still apply side loads via hard riding. The rocker allows the bike and trainer combo to move in unison with what I expect to be less stress on the dropouts and connect frame members.