The bedroom curtain track. The trick was to get the location right so it not only cleared the bed below but also the smoke detector and antenna knob. I worked out a template on the living room floor (laminate) and drew a large radius partial circle. Then I transferred that to a piece of 1/4" plywood which I held up to the ceiling and marked out the exact location of the track. Must have been an accident because it all worked out perfectly. The aluminum track comes in 8' lengths and for some reason, after bending the track, it reached from one side of the trailer to the other without being short or having to cut any. Weird how that works sometimes.