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Looking at the specs for your trailer you have a 30 gallon black tank and two 30 gallon grey water tanks. This indicates that there will be a third valve under there. Most likely it will either be just in front of or between the two tires on the driver side of the trailer.
As for which handle is which about the only real indicator you'll see is that the black tank generally is plumbed with a 3-inch pipe, some of the gray water especially those that come from the shower are also 3 inch. Generally speaking the pipe from the kitchen sink or galley will be an inch and a half pipe and will be tee'd into one of the other three inch pipes... after the valve.
Javi
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2015 Ford F350 DRW 6.7 Diesel XL
2020 Avalanche 313 RS
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