without knowing more, it could be coming from lots of places. On our trailer, the toilet sprung a leak in the valve that's on the top of the toilet. Whenever we'd flush, water would leak onto the floor. There's also the valve in the black tank flush system that's prone to busting and leaking (especially when the factory accidentally installs it backwards or you forget to winterize your black tank flush line), the water lines going to the sink, toilet, and tub/shower, and the drain lines for all of the aforementioned. Since it's coming from the direction of the sink, I'd do like chuckster suggested and start under the sink area. I'd check the lines to the sink faucet (connections to faucet, any T's or splices, etc), the faucet itself (might even only be leaking when faucet turned on), and the sink drain line.
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2012 Keystone Vantage 32FLS
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