Clearly the sock issue is at the core of the service dilemma. Presuming the JMT runs approximately North-South, and presuming a direction of motion, different sock qualities will be appropriate for each foot, unless of course one has only one foot. This follows from the differential exposure to solar radiation experienced by both feet; architects well know that afternoon radiation is far worse than morning radiation, and the sock composition needs to take account of this.
A possible compromise is to differentiate both sides of each sock, but recall that during morning and afternoon periods (as opposed to midday) the foot closer to the sun will experience greater heat gain, and will tend to shade the other foot for at least part of the stride.
A related issue is the direction of the Earth's magnetic field, and the inclination of the direction of the trail to that magnetic axis. Piezo-electric effects may be expected in at least the 4th toe of the foot closer to the direction of the Moon during the first and third quarters, and these will affect the durability of the sock material, and may lead to blistering, especially during periods of high sun spot activity. However, this may also be turned to advantage by capturing the electricity produced, which may be used as a source to recharge devices, such as sock warmers.
I trust this may be of sole benefit to the discussion. If not, I would feel a heel.