I seem to have a vague recollection that there was an official place for trucks to go at the circuit.
I thought at one time there was a possibility that DfH would have to unload their truck and then take it somewhere else to park up for the week (Of course the Dutch charm and some strategically placed beers meant it wasnt a problem after all!
).
Might be worth sending Paddy_NL a pm to see if he has any info.
F