Arm out the window that may explain a few of them...
How wide are the tyres on a Caribou, some of these were about 60cms I would guess? Possibly even a bit more. They were also followed by some rather long, bouncing type skid marks!
The entire perimeter is now fenced off. I think it's the first time I've seen an aerodrome chart with " bird, animal and pedestrian hazard exists" !!