Technically, it's specific to a certain set of vehicles made. I'm not 100% sure but the AS platform for the 1991-95 Caravan's is only for that specific for those Chrysler minivans. Here's a link that shows the internal code's for the Chrysler vehicles
https://www.allpar.com/forums/threads/master-platform-body-codes-list.81103/

We already use a ton of these body codes on the website already. AS is another one unless they are incorrectly listed.