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Would the overhead be the same if Tesla was installing 2 stalls at a location compared to 6 or 8 (what they're doing now)?
Pretty much yes. The cost of the chargers and stalls and a slightly larger enclosure is, from what I've gathered from other people, small relative to the cost of doing all the trenching and other "fixed" infrastructure costs. The time required isn't hugely different either.
But the "temporary" Superchargers - those two stalls plus charger cabinet on a "sled" things - can no doubt be installed much more quickly and cheaply.
I'm not sure how Tesla is making these decisions, as they seem to have gone the "two stall temporary" route in Europe. For example, look at the south of France - Nimes, Avignon, Aix en Provence, Fréjus - all 2 stall installations.
Update: see for example My southern european roadtrip (with photos) | Forums | Tesla Motors