Update on this slow drain. I rebuilt the p-trap and drain pipes to go around the drawers so I could lower the p-trap 3.5" which increases the height of the AAV valve and moves the water level down below the basket strainer. The drain is still slow but it is visually much better as the water level disappears into the tailpiece. I also tried tilting the motorhome to create more slope in the grey tank away from the outlet of the kitchen sink drain pipe and it had no effect. I am still uncertain of why this drain is so much slower than the shower drain. Coincidentally I received communications from the Thor concierge department stating that they want to contact me several times in the next year to see how the motorhome is doing and how the dealer is doing. They gave me contact info and encouraged me to contact them with anything at any time. I sent a detailed email describing my slow drain, pinched wires and fuel line under the grey tank, and outlet pipe from grey tank sloping up. I also included a drawing of the drain circuit. I was positive, provided facts, and simply asked if they could provide me with any information that might help me. It has been 4 days and I have received no reply from Thor. At this stage I am going to be happy with the progress I have made on the drain, continue working on the other issues myself, and not have any expectations of what Thor's concierge department might do for me.
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