Transom Savers… my thoughts on this subject:
If the boat is securely attached to the trailer, then a “rigid” transom saver should not do harm to the motor, transom, or trim hydraulics. That is unless the motor is lowered down so hard on the saver that the motor’s lower unit housing cracks.
If there is any slop between the boat/motor and trailer because of a loose tie down, or there are springs (or rubber) built into the transom saver, then the trailer and motor can move independently when going over bumps in the road. This may put extra strain on the trim hydraulics and motor housing (where the transom saver touches to the motor).
The stress put on a transom when trailering is insignificant compared to the stress put on the transom when on the water. Modern boats are built with very strong transoms. Are there any boat/motor manufactures that actually make transom savers? One would think they would build one themselves if it were important to the integrity of the transom.
A rigid block of wood keeps the motor up and protects the trim hydraulics. Similar devices that are cushioned will allow the motor to bounce a bit when trailering and can therefore put stress on the trim hydraulics.
In conclusion: I will not put a transom saver on my rig or any cushioned device, as I believe it can do harm to the motor housing and/or it’s trim hydraulics. I use a rigid block of wood.
Dave Gulczinski