When draining there should be several valves to open to not only draining the tank but the lines as you don't really need/want stagnant water left in the lines or the tank. Simple way if you know where the valves are located is to just turn the valve and see if water comes out the bottom.
but for a better picture and more info, this a site where you can study all the parts to your specific RV and the specific build date or serial number:
https://catalog3d.winnebagoind.com/menu/Parts.htm
I choice a random serial number that may get you close and give you the idea of what and where to look on 2015 vista 30t.
This drawing is from underneath looking "superman style" up through the bottom. Three little green marks appear to be three drains to the ground and the large green arrow should be the direct drain out of the tank. for draing lines, the yellow marked valve is one and then you want to be aware of several other points like the outside shower hose to lay down and rain out as well as there is a valve on a suction tube which lets you suck antifreeze into teh lines for winter. The red mark is a small filler which will often have water left in it, so be sure to drain it if going for freezing weather!
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Richard
Why no RV year, make and floorplan on MY signature as we suggest for others?
I currently DO NOT have one!
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