It's that time of year. Need to winterize the travel trailer. We had our last trailer for sixteen years and a windstorm totaled it out. This Spring we bought a replacement, and we just finished our first summer of camping with it. Love that trailer! This is our first time for a slide-out and we're enjoying it.
For the old trailer we could blow the lines out with compressed air and all was fine. This trailer has a more complicated plumbing system, and no drawings to show how anything works and the Owners Manual has a minimal explanation of how to winterize.
So, I had to draw the plumbing out to see how it worked. Then I cruised some YouTube how-to videos. Once I understood how these things are done, the cryptic directions in the Owner's Manual made sense. The rest is history. The winterizing process worked fine. Then, all that was left to do was sketch it.