I wonder what type of wheels these computer chairs need for grass & grey sand?<br /><br />

Went out for a couple of hours this morning & this is what was set up on the footpath in front of our house when we came back. Couldn't get into our double driveway ,the vans rear was in the way ,the garbos left the bins in the drive way too ,after he emptied them.I suppose it was slightly better than a few weeks ago when he managed to get the bin underneath the truck in front of the rear wheels after he emptied it.
A day later this man sat on the metal box swinging his feet against it for about 45mins from when noticed him ( about 6ft tall late teens or twenties )Husband told him he shouldn't be sitting on it & was told he didn't F.... care.We have never seen him before, he probably doesn't live in the street rather suspicious we think.Now husband has gone to get a security camera he saw this morning.