Finally, after buying the MH in February, we went on our first 2 day test trip. This was great experience and we were surprised that everything worked. My wifey even said that this was the best family investment I have ever purchased. However, we did have one small issue that gave me some headache. On our first morning, I discovered that shower was filled with water and it started leaking to the bathroom floor. No biggie, I drained both grey and black water tanks and water in the shower disappeared. The very same day the same thing happened again, water in shower coming out of the drain, so I pulled the valve for grey water and water in the shower drained out. What is going on? According to Winnebago manual, the grey tank should hold 12 gallons or same as black tank as well as fresh tank. Am I forgetting something? This is our first MH and I am very new to this. I checked the two ring valves near fresh water tank and they are both pushed in. Please advise. We are planning a long kiteboarding trip to Vancouver Island and with two small children I need that grey tank to work. Thank you very much for any input. Much appreciated.