>>1500664>says multiple haulsAye, very likely. There's only one access point which is a small foot bridge over a rail line, just big enough for a car, and there are deep tyre prints in the mud, meaning someone has been driving in and out through the industrial area nearby. Hence it's almost certainly workers of some kind. If not the tree guys then some of the local chemical? plant guys for somewhere to eat lunch or something, which would explain all the energy drinks
It's a little strip of woodland between the motorway and railway (you can hear both while sitting here, but can't be seen)
Anyway, heading back soon with the DSLR, some solar powered lights and some teabags and coffee and that soon, will report anything interesting