It turns out that Rhonda is on the right track --- the gutters on our roof would have been installed correctly if the whole trailer didn't tilt toward the west.  It started raining, so we haven't finished the project yet, but I think we're going to first try taking out the screws that attach the gutter to the side of the roof, then will give the gutter more of a tilt, if possible, so we can keep the downspout where it is.  Worst-case scenario, we'll move the downspout to the other end.

Interestingly, in a heavy rain Friday morning, I noticed that the downspout seemed to be working pretty well despite the incorrect tilt.  Sure, a bit of water was drizzling out the other end, but most of the roof runoff appeared to be going down the downspout and into the greywater wetland, which seemed well able to handle the extra water.

On the downside, it turns out that the high groundwater in that spot isn't entirely due to water pouring off the trailer roof right there.  Even with that rain being captured by the downspout, water was pooling right at the surface, meaning I need to keep working if I don't want the grape and kiwi I'll be installing there to drown.  I'm hoping the extra water comes from the other downspout twelve feet uphill which spits out water falling on the front porch, but I haven't quite decided if there's a solution short of channeling that water into the greywater wetland too.  I'd like to have a rain barrel at the corner of the porch to make watering seedlings easier in the summer, but we get so much rain that the barrel would do no good in the winter.

Finally, just for fun, I piled up lots of rocks around the kiwi and grape mounds.  Hopefully these will act as thermal mass and they'll definitely make the plants more visible so they won't accidentally get weedeaten.  And we're also thinking of taking Brian's advice and making the trellis out of wire since he makes an excellent point about the shade potential of lumber.  I can't wait to see this area in full greenery in summer 2014!