The first ever mobile lethal injection van was actually, as far I know, from Delaware in 1986 : http://www.doc.delaware.gov/deathrow/history.shtml [1]
Beyond lethal injection vans, around a half dozen countries also employed gas chamber vans, with the first known example being in Nazi Germany.
[1] For some reason Wikipedians came to a consensus that only Chinese execution vans should be mentioned in the article titled "Execution vans".
The first ever mobile lethal injection van was actually, as far I know, from Delaware in 1986 : http://www.doc.delaware.gov/deathrow/history.shtml [1]
Beyond lethal injection vans, around a half dozen countries also employed gas chamber vans, with the first known example being in Nazi Germany.
[1] For some reason Wikipedians came to a consensus that only Chinese execution vans should be mentioned in the article titled "Execution vans".