I took a set of pups originating in HST bound for DEN to a meet/laydown at SPC (Colorado). After arriving and checking in at the motel, I do a post trip, lo and behold, something is leaking out of the back pup. The forwarding driver calls Central Dispatch, and they have him break the seal and start checking the load. Loaded on the rear was a skid of 5 gallon pails of motor oil. You guessed it, the skid "walked" itself to the rear far enough to leave a substantial gap between the skid and the freight in front of it. There were no load bars or pallets anywhere to be seen that would have kept the skid in place, and as a consequence the pails shifted forward and now we have a spill. To make matters worse, Central Dispatch had to call an environmental cleanup team from a city 3 1/2 hours away. The driver offered to go home, get some cat litter and clean up the mess himself, but it was not meant to be. Because somebody tried to shortcut the proper loading procedures we have the following:(1) a preventable spill, (2) a huge cleanup bill, (3) multiple delayed shipments, (4) paying the forwarding driver delay pay ( he left 4 hours late because of the wait), and (5) paying me long layover pay, (6) lost goodwill from customers on both ends of the shipment (possibly the greatest expense of all). All because a couple of somebodys tried to shortcut proper load securement procedures. Just think what would have happened if a state DOT officer had gotten involved in this!