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Those pull drains are typically very tight since they need to prevent water leaks onto the ground during normal seasonal use. Since they may not have been used for years and depending on the hardness of the water in your system over that time, the non working valve may have some residue of hard water calcification on top or inside......just guessing here. You could try wetting the valve body for a while with a small rag soaked with a de-calcification chemical (like those used in furnace humidifier trays). There are stronger de-calcification chemicals out there but start with something more environmentally safe to see if that's all it takes. Also make sure the drain portion of the valve that extends beyond the bottom of the coach is not plugged with road grime.
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