As an ex-Rans S6 owner who knows how solid that leading edge tube is, I'd be more worried about the mini-van!
However, the guy didn't do himself any favours by pretending nothing happened. I'm sure if he'd parked up immediately and given it a good look over, and perhaps left a note on the mini-van, this thread wouldn't be here. The S6 has the benefit that you can easily access all the important bits to check for any obvious damage, as patowalker alluded to above. I've not been to Redhill, do you often have mini-vans on the airfield?