We have a 2012 Tango Towlight 28RLS travel trailer. Ever since it was new I have had difficulty filling the water tank. Even with the water turned on relatively low, it tends to come out of the overflow. I have tried the filler tube attachment that is inserted about 6 inches into the fill port but I still get the same result. The only way to fill the tank is to press the hose tip onto the fill port and tightly hold it there so water can’t overflow. It’s almost like I’m pressurizing the tank and working against that pressure. Is there some trick I’m missing? Filling the water tank should be about the easiest task, not a difficult one.