Officials said the trailer disconnected from the rig and slammed into the van, ripping it apart.
Spokesman, Jamie Jardine, said no-one was injured and staff were gradually being returned to the rig.
The rig, known as Scarabeo 9, is expected to arrive in November or December.
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The rig in question is said to be located in the West Delta Block 32.
Morning of April 21: Firefighting vessels start backing off as the rig starts listing.
For the rig Sterling Vaughn oversees, regulations and the company's goals call for zero pollution.
When viewed from on high, the rig's sharply tapered edges lend it a deceptively thin appearance.
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The rig exploded in April, killing 11 oil workers and leading to a huge oil spill.
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Earlier assessments also indicated the rig was in good condition and posed no environmental hazard.
The rig, which was leased by BP, exploded on 20 April 2010, killing 11 workers.
Even more alarming, the rig survivors said, was the amount of resistance the well was giving them.
Monday night, tug crews had to cut the rig loose during a storm that whipped up 24-foot waves.
According to reports, the rig is 25 miles off the coast of Louisiana.
Revette was among the 11 workers killed when the rig exploded that night.
For a mission, the rig and control vessel are moved south to the equator at 154 degrees West Longitude.
The rig was aground in an area of Ocean Bay, where water depth is 32 feet to 48 feet.
Before the rig exploded, America was inching fitfully towards a coherent energy policy.
Nor did it shut off the flow when its connections to the rig were lost, as it should have.
The rig had been working in the Beaufort Sea, off Alaska's North Slope.
Brown, the rig's mechanic, had traveled with the rig from South Korea, where it was made nearly a decade ago.
None of those 11 workers who died on the rig floor could have imagined that this would happen to them.
The rig was owned by Transocean ( RIG), but it was BP ( BP) who owned the doomed oil well.
Transocean has largely blamed BP, saying that as the operator, BP had final responsibility for all decisions on the rig.
These tune the rig to save power, run quietly (disable the fans), work efficiently or crank performance to 11, respectively.
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The rig exploded in the Gulf of Mexico in April 2010, killing 11 workers and leaking four million barrels of oil.
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Transocean (RIG), which leased the rig to BP, and Haliburton (HAL), which provided services on the rig, have yet to settle.
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This prevented the rig, similar to the ill-fated Deepwater Horizon, from working for half of its first six months in the field.
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The BOP used by the Deepwater Horizon was manufactured by Cameron in 2001, and had traveled with the rig throughout the years.
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The BBC was given exclusive access to film the rig in action.
Williams explained that the rig had already been working the Macondo prospect longer than anticipated because of delays caused by drilling problems.
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