Where were the tankers built? In the US?
New Orleans.
It was a simple matter to convert the plans from the ARCO tankers to LNG tankers. It was done without consulting BP and Exxon, apparently. But then neither Exxon, nor BP consulted Conoco. Marine is a very lucrative end of the business and BP is precluded from getting in on it, though they do have a straw company that they operate on the West Coast and Exxon is just gun shy and has divested their marine dept.