Depending on the time frame; There would be a variable number of trailers. Would they have a tractor under them? An R model MAC or a number of cab over designs from Freightliner, Peterbuilt, and Kenworth were in use throughout the 60's and 70's. The standard trailer length was 20 ft or 40 ft. In the early 80's, the standard length trailers were augmented by 24 ft and 45 ft trailers. In the early 90's, the DOT added the 27 ft "pup" (designed for doubles & triples) the 48 ft and 53 ft trailers to the list. most trucks became "conventional nosed" after length restrictions were lifted in 91.
If you look at modern COG (Continuity of Government) sites, many of these are played out mines (coal, copper, or limestone). I game, you would just drive the trucks down into the mine and seal it shut. There are abandoned mines all over the US.
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