We were at a CG in Oregon a few years ago. We bought 2 large loads of firewood and unloaded it next to the trailer then went for a sightseeing drive. Got back to find every last piece of firewood was gone. The CG office insisted they had nothing to do with it so I drove around the entire CG of around 300 sites looking for it, staring intently at everyone's pile of wood. Sure there was no chance of finding it and it all looks pretty much the same, but I was so p*ssed off. Who the heck steals someone's firewood?
The CGs we now frequent are quite safe and we leave stuff all the time as do others. We only lock the TT if we're out for a walk to the far side of a CG or out for a drive.