Do not try this at home!
According to some of the comments its a concrete recycling plant so the damage wouldnt matter but how many times have you wanted to do this after hearing “not ready yet driver, just need to wait”?
Amazed if the rear light clusters never got smashed after that. Wasn’t quite fast enough pulling away and a few looked to bounce back to the clusters.
Isn’t It coincidence that our Dozy is also doing pre cast concrete too
Poor Dozy!
Did just that years ago. Was delivering 8 pipes to a site and their crane had broken down so they laid a bed of sand behind trailer and rolled them off one by one. Tipped in 10 minutes 
wing-nut:
Did just that years ago. Was delivering 8 pipes to a site and their crane had broken down so they laid a bed of sand behind trailer and rolled them off one by one. Tipped in 10 minutes
No chance if doing that now. Their all individually chocked
we used to tip newsprint reels that way onto the loading dock at the old Daily Record works at Anderston Quay in Glasgow many years ago… the dock was level with the trailer bed though, and on a slight slope,…
clamp truck driver would press against back reel, we would take all chocks out, and then clamp truck driver moved out of the way while your load tipped itself in about 10 seconds…
and they had a rather good canteen, so you went and had a slow leisurely breakfast afterwards, and told your office how bad a tip it was… that’s once you had found a working phone box in Glasgow…