aa62, Re the Herc trailer, back in the day (80' thru to mid 90's) we had the "Exhibition Production Flight" at Henlow, they were a motley bunch drawn from any trade, as long as you had a skill they could use your trade mattered not. They produced all the exhibits for shows inc Royal Tournament, one of which was the Nimrod fuselage they built on two 40' semi trailers, a fine bunch who went the way of contactorization in 1997.
PM