Thanks for the list Buzzy. I've been thinking about this for a while now.
Questions, if the lines are well blown out with compressed air (awesome tip about blowing out the toilet with the peddle down btw), is it still necessary to add anti freeze to the system? For sure all the traps and toilet need to be treated, but I am leery to add the stuff to my fresh water tank as it is near impossible to completely drain as far as I can tell. This would make it hard to get all the chemical out in the future.
Also wondering about the final winterized state of the black/gray tanks. Should they be left dry, or should maybe some antifreeze be put in there to keep things from drying out? I can see an argument either way, but I'm new to this game.
How about interior heat? I'm thinking of getting a small electric heater of some sort (radiant, forced air, heat lamp like for reptiles??), along with a small fan to keep the air moving inside. I'll probably pull up the fabric seat covers for our dinette and rear table, then remove the fiberglass seat covers underneath to expose the plumbing and tanks below to some of the conditioned cabin air.
Oliver really needs to get their winterizing video back up. But thanks again for your tips.
Dave