Hi Ollie:
With regard to failure of Sketchup to create a Face on one of the top-surfaces of the trailer in your original 3D Model:
This may be avoided by making certain that the relative angles at each end of those surfaces are in exact alignment with each other in 3D space, so that they are parallel ...and thereby capable of allowing formation of a "continuous" planar Face.
Thus, the angle at the front end of each surface must match the angle at the rear end of each surface, even if the overall size of the front end is larger than the rear end.
In the Cobra 2-seater glider trailer diagram attached in my latter post above:
https://www.fsdeveloper.com/forum/threads/glider-accessories.445461/post-823232
...the hand drawn shapes of the lines which depict the front and rear ends of the top surfaces do not accurately reflect a parallel, matching angular orientation of Edge lines required to be drawn in Sketchup (or any another vector drawing / 3D modeling application) in order to to create a "continuous" planar Face without interposing a break-line, or fold, where such a planar surface would NOT otherwise be "twisted" somewhere along its surface.
Hope this helps with the trailer redesign process.
GaryGB
With regard to failure of Sketchup to create a Face on one of the top-surfaces of the trailer in your original 3D Model:
This may be avoided by making certain that the relative angles at each end of those surfaces are in exact alignment with each other in 3D space, so that they are parallel ...and thereby capable of allowing formation of a "continuous" planar Face.
Thus, the angle at the front end of each surface must match the angle at the rear end of each surface, even if the overall size of the front end is larger than the rear end.
In the Cobra 2-seater glider trailer diagram attached in my latter post above:
https://www.fsdeveloper.com/forum/threads/glider-accessories.445461/post-823232
...the hand drawn shapes of the lines which depict the front and rear ends of the top surfaces do not accurately reflect a parallel, matching angular orientation of Edge lines required to be drawn in Sketchup (or any another vector drawing / 3D modeling application) in order to to create a "continuous" planar Face without interposing a break-line, or fold, where such a planar surface would NOT otherwise be "twisted" somewhere along its surface.
Hope this helps with the trailer redesign process.

GaryGB
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