Fresh water tank drainage
To drain the fresh water tank I had to crawl under the trailer and loosen the plug. With this mod, I can just turn the value on and if necessary direct the flow with a hose.

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The original drain plug. I needed a large spanner to pull it loose.
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I removed the plug and added two elbows, a valve and a section of PVC pipe.
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This is a close up of the valve, I added a brass fitting to which you can either have a cap (as shown) of a garden hose.
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This is the end with a section of hose. You can either drain unto the ground or into a blue tote.

Courtesy of He Ruide [Image Can Not Be Found]