Heres the other train of thought. Connecting the lower unit to the trailer transmits everything the trailer "feels" directly to the motor. Also, think about it, the stress the motor (and therefore the transom) goes through when flying down the lake in rough water are far greater than they will have in any normal trip on the trailer.  I watched my 225 Merc hammered for 2 years in the rear view mirror using the traditional long transom saver. Bought a Lock & Stow and now it is smooth sailing.

Using systems like that do nothing to transfer the strain of the engine bouncing away from the transom.  You still have the weight of the engine pulling down against the top two thru-bolts in your transom.
Like Chris, I prefer the traditional "Motor-Toter" style for long trips.

Smitty

I cut 2 pieces of 12 inch long by 2-inch diameter PVC pipe that I use over my prongs. It works the same way as those fancy ones. Cost about $5 for 10 feet of PVC pipe.

Stu

I have thought about them, the only thing that keeps me from getting them is that I like the long transom saver, as I feel it makes the whole boat, motor, trailer one full unit when towing.

Russ, check out the similar one made by pro-rule.  I have it and like it much better. $50.00  Jack

Hey guys have you seen a new product called M-YWEDGE. Instead of that long transom saver you currently use, for $29.95 you can get this wedge that fits onto the prongs that is only about 8 inches long that snaps on and off very easily.

Russ