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even with them on the roof, leave them flat, while the ones on the other side are at angle.

If you wanted it really fancy...you would have linear actuators on both sides. Parked perpendicular to south in the summer. And your actuators would shift the panels throughout the day to match the sun's angle.

In the winter you probably just want all the panels pointed south without much shifting. So the trailer would be parallel to south.

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