Hey,
if I have understood you correctly you want something like this:

Maybe there is another method using a curve creation method but I wouldn't know how to exactly create those curves. So this is what I did:
- Create a parallelogram via the polygon creation tool.
- extrude its face
- delete the back, front, and bottom face
- bevel the 2 edge edges and really crank up the divisions for a smoother curve (or you need to rebuild the curve)
- select the edges which are forming the wanted curve
- convert the edges to a curve via Modify -> Convert -> Polygon Edges to Curve and open the settings!
- Settings: Form = best guess and Degree = 1 Linear (that's why we needed a good resolution of the curve)
- with the selected curve open bonus tools -> modeling -> curve to tube mesh
- play around with the settings until you are happy
- Done!
Edit: I would suggest setting the length divisions within the curve to tube mesh settings to 1 otherwise you have unequally spaced out edge loops within your tube.
Here are pictures of some stages:



Regards,
LifeArtist