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Phil just read your post this morning. I tried what you said yesterday as you can't put a floor jack under the engine. My original BW Karavan trailer is not high enough to put the engine all the way trimmed in without the skeg hitting the ground even with the tongue lowered all the way.
I did built a double "U" out of 2"x 4" to support under the skeg, straight up to the cav. plate and support also each side on the front of the cav. plate. Lowered the tongue, and used the engine trim to put motor on the ground. Loosened the nuts asked one of my two adult sons to help me keeping the engine balanced but was unsuccessful in convincing them to come home with me(20 minute drive), even after I bought Sunday breakfast for the four of us.
Needless to say it didn't happen, the motor is still mounted center holes (2 from the top or 2 from the bottom however you want to look at it) with the cavity plate even with the keel.
I'm ready now and if I have help can do it in 1/2 hour or less.