You will get a variety of replies to this one. I do not like the the traditional "transom savers". The ones that connect the trailer to the lower unit on the engine. This type induces every bit shock and vibration directly into the lower unit of the engine and ultimately into the transom. They kind of do what you really don't want and are trying to prevent by using a "transom saver". In my opinion the boats transom probably sees much higher levels of stress while powering the boat up on plane and carrying the weight boat at speed out on the water. Add in some rough water conditions and the punishment that the transom has to endure increases even more. The travel while on the trailer should in comparison be much easier. I think that it is important to keep the engine from bouncing and it would also be good to keep the engine from flopping to one side and then the other. The good old block of wood strategically placed between the engine and mount will do the job and there are a broad range of modern stabilizers and engine supports, some of them expensive that also do the job. There are a few engines that have a good tilt lock mechanism that is perfect for trailering and even recommended by the engine manufacturer. There are also a variety of steering locks that keep the engine centered and prevent it from flopping over to on side or the other. Most of these are intended for the newer hydraulic steering systems.