I didn't think it would be easy or that it wouldn't create a different problem 'on the other side'
For others encountering this problem:
For my current situation, a car ramp, I have solved it by having 2 straight slopes and a flat 90dg curve at half height in between. Not a smooth decline all the way but for my current project it works just as well.
Export the three parts together after setting different colors for sides and top. Edit the obj and mtl file to change the material properties to 'Sides' and 'Top' and change the naming 'wall' to 'ramp'.
This gives a very clean object after import as "Car Ramp".
While busy I created the same object with a 30° and 45° angle too.
28kB for an object that spans over 33mx33m in the plan.
I'm not sure if there's a solution for the sharp corner with a sloping wall. Maybe use a square flat piece of wall at the corner with width and length of the sloping walls. Not perfect but probably better than the tilted tops.
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