We have a '08 Forest River Cardinal. A couple of nights ago our sinks backed up. We emptied the tank, plunged (with opposite drain plugged) and then took the p-trap off. The trap was completely clean. I used a 10ft. snake last night and no issues poking through. Put everything back together and after about 30 seconds of running water, it starts backing back up again. Checked the vents on top of the trailer and no issues. What do we do now? The plan this evening after work is to use the snake from the water tank. Any other ideas?
You don't say if this is a new to you Cardinal or not. If this is new to you, it is possible that you have more than one grey tank and one is full and one drained. I don't know the config of the tanks on an 08.
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