I'll share an idea I i have been kicking around (but not tested yet) for low profile rollers for front skirts in lieu of conventional rollers. Mount two lazy-susan type spinners flat against the wheel skirt, one on each side with the centers more to the inside of where you would mount your rollers. Skin them with a circular layer of HDPE or UHMW (less friction for the initial contact). If you turned the wheel, it would push the tire into the flat face of the plastic (close to the edge), which would then begin to spin the lazy-susan. The further you turned the wheel, the more it would move towards the center of the plastic lazy-susan spinner combo. It would be important that at full lock it didn't make it to the very center, as you never would not want the wheel to contact the center as that wouldn't spin. If you had enough room vertically, you might actually be able to fit just one large spinner instead of two.
Just an idea for you to consider.
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