gimp - maybe this will help - your fresh water tank is actually in the front under your convenience center. On your model the water pump is back in the rear by your water heater.
Even though we put the suction line as low as we can, you will normally not be able to suck all the water out with the water pump. However, the fresh tank drain is on the bottom of the tank and should allow you to get most all of it out. I'm pretty sure it drains right under your convenience center (or close to that point).
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Prime Time Manufacturing, Manufacturers of travel trailers and fifth wheels