I do not have an answer for you but I'd bet someone here has experience with your model trailer and knows the location of the fresh water tank. It may take a while for them to find your thread, hang in here.
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2000 Winnebago Ultimate Freedom USQ40JD
, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA.
" My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy