I located some wall studs. I used oak wood and made the mount. I got the aluminum outboard mount on Amazon. It works great for my 8 hp 2 stroke (32 kgs/71 lbs)
Putting those wood blocks onto a dolly would make it movable to the car without lifting anything. Some even put wheels on the handles and use it roll it into a vehicle without ever lifting more than half weight. There is even an entire thread on moving outboards semi recently.