I try to keep my tanks full as much as possible. Since I am just over the hills on the coast from you, we face the same maritime climate.
This spring I took the tank out of my D-6 9U which is over 50 years old, and we coated it because the rust was getting pretty bad. It would be an expensive project to do to a larger tank, though a round tank would have made it less work.
I like your mount it on a trailer idea, I think I can make use of that idea.
