>   .If you have ABS (dunno if Vans came so equipped) you should feel a buzzy,
>pulsey vibrating, telling you that your wheels are starting to slide...and
>the ABS IS working.

Yes, 3-channel ABS was available later in the 80s.

>   Has anyone ever locked the front wheels of their van during an emergency
>stop in their van?  On dry pavement, of course..

I could do this easily in my 57 T1 Split. In my 75 T2 Bay or 84 T3? No.