Pic below shows how I made a secure anchor for my 12 foot Gregor and trailer by digging a hole and casting some galvanized pipe in concrete. Boat is locked to the trailer, boat is locked to the ground, and trailer is locked to the ground. All using THICK (expensive) security chain and (expensive) motorcycle security locks. I also have a hitch lock on there for good measure.

The pipe is filled with concrete so it'll quickly tear up any blade designed to cut metal.

As for the motor, I would avoid bolting it on. It's much less likely to get stolen if it's on an outboard motor stand in your garage...

If you're worried about the clamps scuffing up your boat, get one of these:

https://custom-rubber.myshopify.com/products/custom-rubber-transom-pad?variant=1049140805





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Unless the transom is soft for some reason, you shouldn't need to firm it up.

The transom on my Gregor was toast when I bought it. Soft and squishy with dry rot. I made a new transom board and swapped it out.


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My old man has a 10' livie we've been using to harass the local bass population. 

If you have a secure place to park it i dont see a need for all the precaution.  Ive never seen a clamped engine come off during travel, road or water.  They usually have beefy  hinged knobs on the clamping screws that hang in a down position and take some effort to spin, they wont generally back out on their own. 

Only thing id add to my pops rig is some side guides on the trailer, the cat hull is a pita to get back on the trailer in a cross wind or current.



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No worries.  I use one with a 15hp.  Doesn't alleviate the shock from every bump but does add significant support.  I have towed the boat hundreds of miles, many of those on bumpy dirt/back roads without damage.

Just look at the brand options and you should be able to find the mount that works best for attaching to the trailer.

tight lines
pete