By way of Disinfo.com, I found this report by Tim Boucher:
What is that fine looking vehicle, you ask? Why, it is part of “China’s new fleet of mobile execution chambers.”
Makers of the death vans say the vehicles and injections are a civilized alternative to the firing squad, ending the life of the condemned more quickly, clinically and safely. The switch from gunshots to injections is a sign that China “promotes human rights now,” says Kang Zhongwen, who designed the Jinguan Automobile death van.
The AOL News link that Boucher cites doesn't appear to be working, but I found this June 2006 USA Today article on the execution of convicted murderer-rapist Zhang Shiqiang in one such death chamber-on-wheels (which appears to be the article Boucher quoted and attempted to link):
The country that executed more than four times as many convicts as the rest of the world combined last year is slowly phasing out public executions by firing squad in favor of lethal injections. Unlike the United States and Singapore, the only two other countries where death is administered by injection, China metes out capital punishment from specially equipped "death vans" that shuttle from town to town...I could just see something like this being supported by both major parties here in the United States. Why, just think of all the "terr'rists" they could round up and execute!
For years, foreign human rights groups have accused China of arbitrary executions and cruelty in its use of capital punishment. The exact number of convicts put to death is a state secret. Amnesty International estimates there were at least 1,770 executions in China in 2005 — vs. 60 in the United States, but the group says on its website that the toll could be as high as 8,000 prisoners.
And it's all perfectly humane! No muss, no fuss.
(Cross-posted at the Strike-The-Root blog.)