I agree with Steve in his Curtain Rod assumption. I wouldnt suspect that these are load bearing because other than the top shelf, the vertical rods are not going through the shelves. Most reasonably priced wheels have brakes so the pull yourself along idea would not work. The ones that dont have brakes would be dangerous. The idea is not to slide rather than use the dangerous idea of pull yourself along. Just get off the ladder and re-position it. Therefore it is there purely for aesthetic reasons. If it were me, I would also include a photo of the rod and end fittings on the receipt if you cannot get an exact match.
If thats what they want, go for it.
Also note that you cannot stack the books from end to end Enough space must be left on the shelf to squeeze the books past the rods
Tony B Retired woodworker, among other things.
"Strive for excellence and settle for completion" Tony B
Last edited by Tony B; 12-25-2018 at 09:03 PM.