Steve, thanks very much. The one under the fresh water tank has not had a cap on it for several years because the trailer is on a permanent site and we don't use the fresh water tank, so no problem there.
Per your description, I found the two on the street side, right where you show them, but up higher where you can't see them unless you crawl under there (my bad neck doesn't like this, but I did it!). :-)
Are there drains under the hot water heater? I do not see any, but I do drain the water heater every year.
Henry Spencer
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