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I've always had stiff gate valves. What I tried recently was to flush the tanks thoroughly, close the valve after letting the tanks completely drain, then mix about 1/2 cup of liquid Calgon water softener and a good squirt of dish soap in about 1 gallon of water. Pour down toilet and same for grey tanks. Let it sit for 5 minutes so it makes it's way to the gate valve, then open and close valves quickly to coat the gate sliders and channels that they slide into. I was surprised at how easily they operated after. I've also read suggestions from other members to pour cooking oil into the emptied tank and operate the valves. As long as cables aren't binding and causing the problem, this should help. I do have cables for the black and one grey tank, and now you wouldn't know they were there. Once the lubricity is gone at the valve, the procedure needs to be repeated.
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