Oh no, I've earned myself another angry face!
To be honest I'm not totally sure what a Winnebago is, does it have windows? Maybe the camera crew could have filmed through them?
It sounds as though the nine people were up very close together, jammed even. I'm not sure that the sex act(s) he's describing would really be possible to be honest, I just don't see how that many people could all access roughly the same spot without totally blocking each other off. Maybe I'm just too innocent and naive.
@DannyL has an interesting story about a friend of ours shooting a grot scene in a pie and mash shop on Hackney Road. I think the gist of it was that the owner was happy to allow them to take over the place and use the counter etc for uses it was never intended... as long as he was allowed to stay in situ and basically observe every painful detail of what went on from a privileged position? Is that right Dan?