It sounds like Airstream might have done right in its later Interstate models, because IMNSHO, these rigs should have had the valving feature that you describe from the very beginning, for safety reasons (which is also convenient for winterizing).
I have always thought that Airstream should have been female-dog-slapped for NOT adding isolation valves ("drain valves") to those models where the outdoor shower is basically on top of the electrical converter. The outdoor shower is very vulnerable to freezing. One accidental freeze-thaw cycle and boom, the guts of the electrical system gets soaked, and then what happens?!
When we were designing our DIY lithium system, I (ahem) compelled my husband to spend an extra day of his labor on:
(1) Improving the quality of the plumbing hardware to the outdoor shower (= big spousal argument - it was either that, or remove the outdoor shower altogether, which he did not want to do, so the plumbing improvement was the compromise), and
(2) Adding the danged valves that should have been there from Day One.
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