From the article linked in the post above:

"In a paper issued May 28, the CIA called the trailers “the strongest evidence to date that Iraq was hiding a biological warfare program.” But intelligence analysts from the State Department and the Defense Intelligence Agency have said they believe the trailers were probably used to fill hydrogen weather balloons."

"Military scientists who analyzed the pair of trailers during the summer doubted they were designed to function as mobile laboratories, according to the three military officers involved in the weapons hunt."

"There were some people who really believed they were for making hydrogen for weather balloons. Almost no one was certain they were biological weapons.”

"Also, it would have been hard, if not impossible, to hide the evidence. No traces of anthrax or any other warfare agent have been found during more than a half-dozen tests on the trailers."

"Last month, Vice President Dick Cheney repeated the claim that the two trailers were “mobile biological facilities” that could have been used to make several biological agents, including smallpox."

"There’s no way that these particular labs could have been used to make smallpox,” said Jonathan Tucker, a weapons expert at the Monterey Institute of International Studies who authored “Scourge,” a recent book on smallpox."

Indeed. Of course the true purposes of these "labs" appear to be to inflate the Bush administration's exaggerated claims about Iraq's non-exitent weapons of mass destruction.