I only tow very short distances with engine on a trailered Sib.
Engine rides in car boot most of the time as the weight of the engine on Sib transom creates a negative trailer nose weight - not good for high speed/long distance towing!
I tend to hang the engine off the transom in shallow drive mode and lash a ratchet strap around the skeg.
Tighten the strap down against the trailer to stop unwanted engine bounce and take things easy.
I must stress that I don't exceed 40mph nor do i drive any more than 3 mile in this state!
Easy does it!
It beats lifting the darn thing on and off while ion holiday for 2 weeks though!
When I had my Achilles 14'/Honda 40, I used to look in the mirrors and see the motor wither yo-yoing up and down, or bouncing side-to-side, taking the transom with it.
I went with a support that cradled the LU and tied in to the rear trailer crossmember, and never saw the motor bouncing against the tubes again. I did have to come up with something to keep the motor from flopping side-to-side, but that was relatively easy.
I bought transom saver from Craigslist for $15 new in box. It was not exactly designed for my boat and trailer, but with a little modification it has been working perfectly. One of the most important things is to have the transom supported.
Hook-A-Duck
The Silver Fox
