You have to accept that they raised the lintels to a height of 24 feet in order to put them ontop of the uprights. That requires either an enormous ramp or a wooden crib. If they used a ramp for the lintels then it's reasonable to suppose that they would have used them for the uprights too. But if they used a crib for the lintels then why should they not have used them for the uprights?
In order to use a ramp for stone rowing, it either needs to be over 40 feet wide, or you must build three ramps (one for the stone and one for each line of rowers).
I think if the evidence categorically says that ramps were used, then we should quietly forget about raising a trilithon and just stick to moving stones around. However, from what I have seen so far, it seems that a bit of compacted chalk in a hole is being extrapolated into a whole ramp theory.
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