Hey Jerry, The wife and I worked through this this week for the first time. We found a video on youtube, but it wasn't the trailer both you and I own.
While this is probably not the 'video' you're looking for, I will offer what we did. Although I will direct your attention to the left where you can see that I to am a Junior member.
First, under the kitchen sink (I accessed it via the little door by your left knee when you step into the main entrance) there's a knob with a hose going up and filled with pink fluid. Close that knob.
We hooked up our hose to the city water hookup (that's the one on the back) then ran water out of all faucets until they no longer ran pink or foamy.
Then we took a 5 gallon bucket and used about 2 cups bleach (because that's all we happened to have left) and poured that into the bucket then filled it the rest of the way from our well. Then poured that into the gravity fill tank spout on the side. Then moved our hose from the city water hookup to the gravity fill and filled our tank.
Then we ran all faucets (on cold only) until we smelled the bleach mix from all faucets. Then shut them all off.
Then we went back to the water heater access panel, opened it and inserted the little white plug. Be EXTREMELY careful with this, plastic plug vs metal receiver; it will try to cross-thread on you. Once you have that in, reach around to the back side of the water heater tank and open the valve, that will let water into your hot water heater tank. If you didn't get the plug in good, this will also be the point where you are wet.
Then we opened all faucets on hot to get the pink out of the lines once again and smell like bleach.
Then we emptied our tank and refilled with fresh water and flushed all lines again to get rid of the bleach smell.
Emptied gray tank.
Well that's what we figured out anyway. Like you, we didn't get much of a rundown on de-winterizing. So if someone else sees something I did wrong I am open to constructive criticism as well.