Caleb, I'm happy to say the boat came with two different manuals for the A4, one from Moyer and one original. All the material I've read has complete instructions for winterizing in the water BEFORE hauling. As I said, a mistake I won't make again next year.
Chuck, thanks for the advice. I'll come back here and either report a properly winterized engine, a seized engine with a cracked block, or a boat that fell off the stands due to the vibration!