the ease with which the top separated from the chassis makes you wonder if it was staged...........if you look carefully at 1:19, the front edge of the coachworks appears to be already detached.
OK, OK, is there any reason they couldnt just pull it by hand???
I mean, a caravan is very manouevrable ON ITS OWN!
And if it was such a tight squeeze to get it out, how did they get it in?
Caravans are very flimsy when they are compromised in any way - hence the chassis came away so easily. Just watching top gear or anything with hammond in it, you'd see how flimsy they are.