re: Cab Over Semi 18 Wheeler's

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Also they had some funky weight distribution that can impact how it scales.

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Aktually they were considerably lighter than their long-nosed counterparts. Shorter wheelbase contributed to this but also made them ride noticeably crappier than the alternative truck layout.

I would guess safety was a major concern and probably contributed to the demise of this configuration as well.

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Has the aerodynamics of a brick.

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This isn't really true and they are certainly no worse than most conventionals that are popular in the US. The biggest reason was change in regulations followed by personal preference of the truck drivers themselves. Cab over trucks have the advantage in overall length and turning radius which is why they are pretty much they only type that exists outside of the US. US truck drivers that are far more frequently using their trucks as a home on the road certainly don't like the idea of tipping the cab for engine maintenance and having their belongings spilled forward.