Had it pop up few times on RPO broadcast over yrs. Mostly gov or export spec trucks that would need more moving around more usual as Keith pointed out.
My current '91 ex-cop truck doesn't have it but my '87 fire dept K30 did.
Loads of mis-info out there...for example these guys...
http://www.astrosafari.com/viewtopic.php?f=9&t=71201
Maybe somebody searching will find this and set their mind at ease.
