Animated Alembic to RBD

[craigls]

I seem to be having a great of trouble trying to get an animated alembic cached geometry that Ive cached to frame 85, to switch to an RBD simulation.
Heres the setup.(iamges attached)

Ive tried putting a point wrangle before the OUT_TRUCK node,
tried 
i@active = 0;
i@deforming = 1;
and RBD key active turning on at frame 86.
no joy
tried disabling the point wrangle(i@active=0,i@deforming=1)
then tried with the rbd key active, 0 on till frame 85, then active, then 1 on frame 86, still no joy.
The animated part does kick in between frames 1 and 85.

Ive tried setting the use obj path to 1, and pointing the OBJ path to the OUT_TRUCK, no joy.

even tried a sop solver, with a point wrangle, and set i@active 1;
then connecting a enable solver, to kick on at frame 86

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Is there something Im missing. I also want to ensure the RBD picks up the velocity from the animated alembic.
Any advice much much appreciated.