Tow the trailer queen there and put all the stuff in the tow car.

Or go with a couple of mates with one car that's not going on track.
As people have already said, there aren't normally lots of pikey types at track days - it's normally just the people doing the day, most of whom will lend you stuff and help out, rather than nicking stuff.
+£100 entry fee thins out any undesireable elements pretty effectively and the marshals and track staff are normally about keeping their efficious eyes on things.