Yes, it's that time of year for some of us.
A friend of mine gave me this link from Fraserway RV
They've got some excellent video tutorials online here:
$9.95 for the DVD seems pretty good to me.
You can watch the "Winterizing your RV" section here:
(high speed internet connection needed)
http://main.fraserway.com/parts_service ... erize.html
I learned how to make sure you get RV antifreeze in the "city water" connection line by watching the video.
The video is not Class B specific but it is very informative.
I use the pink RV antifreeze after using air to blow out the water in the lines. You don't have to do both, most people will do one or the other.
I use a simple pump to add the pink stuff to the fresh water tank. A pump like the ones that attach to drill would work great.
The video shows bypassing the fresh water tank but my concern is that there could be dips in the pipe from the water pump to the fresh water tank where water could accumulate and freeze so I put the pink RV antifreeze in my fresh water tank.
One of my "low drain point" valves is hard to get to. I don't remember having any "low drain point" valves on the actual water pipes in my Roadtrek.