Chausson flash 6 2010

I have  a couple of Questions i need help with, I have just had a  week break in my M/H ,i filled the tank with Cold water and all seemed ok . When everything was set up i noticed a small amount of water on the floor of M/H. I wiped it away and more water appeared my cold water tank was behind the leak. I had a look at the tank and i did see a  bit of water on the floor under the tank so i thought i had overfilled the tank. Anyway i left it for around 30 mins but still water was coming from the underneath where the tank is . In the end i emptied the tank as i did not want to damage the furniture .

My other question is the window directly next to the door has been screwed down it can not be opened if it did the door when open would smash the window if that was open .. Well now i have noticed water on the inside of that window with all this rain we had thought it was condensation but it is certainly rain getting in . 

So now i need help in these two matters . The M/H is no longer under warranty i am quite handy and can do most jobs but if anyone can shed any light to what might be the problem that would be great .