It does look nice and useful. How do you keep them out of the way when driving—do you have a tieback at each end, or in the middle, or something else?
Another option instead of the PVC rod is the
IKEA Kvartal track/rail system. The ceiling mounts that IKEA sells have about an inch or so additional height. I'm intending to replace the cheap plastic slide track for the bedroom curtain in my RV with this, and am planning to mount the rail flush against the ceiling using
these lath screws. Drilling a hole every several inches through the inner web of the track extrusion should allow a (thin shank) screwdriver space enough to tighten down the screws, and the heads fit nicely in the mounting slots of the track.
Mind you, there's absolutely nothing wrong with the PVC piping approach.