Well, as we all know, water freezes @ 32F. So if it gets to that temp or lower you should winterize her OR warm her above that temp. Can you put her in a garage? How about a small electric heater? Remember, you don't have to get the engine hot, you just need to keep it above 32 degrees. Even one of those oil dipstick heaters truckers use should do the trick... If you drain your outdrive the only thing you have to worry about is the water in your block. (Unless you have fresh water cooling, at which time you need to find a way to keep that water above 32 also). Here's an idea....Since the whole thing is under the fiberglass engine cover, I would think that simply placing a small electric ceramic heater in the engine compartment should do the job nicely. Set it on low, put the cover down over it and let it run through the night. It should keep everything below decks in that area all nice and toasty warm. (I'm a firm beliver in the K.I.S.S. principal).
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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