Re: transum saver tiller
First -- if you can trailer with the engine tilted down you don't need one since all forces are vertical and therefore don't pose a problem. If you must trailer with the engine tilted up using the tilt lock, the tilt lock on an outboard is not intended for trailering and they can break, dropping the engine to the road. The principle of a transom saver is to tie the boat, the engine and the trailer together as a single unit. Therefore all forces, including the twisting forces on the transom are transfered to the trailer and the springs that support it. The transom saver also prevents the tilted up motor from flopping from side to side as most tiller outboards tend to do. If you don't believe you need one, have someone else drive your rig on a very rough road while you follow. Lastly, a transom saver does no good whatsoever, and can even cause damage if you don't strap the boat down securely.
WARNING: NEVER attach the trailer end of a transom saver to the axle.