There is generally an INCREASE in assistance work during Anchor phases; this is mainly to keep the hypertrophy as "constant" as possible in the training program. The Leader phase generally uses the supplemental work to drive the strength AND hypertrophy; as this component is decreased in the Anchor (generally, of course), we make up for it with an increase of assistance work. Since assistance work is much less stressful to the system than supplemental work, this should allow one to increase the intensity of the main lift.
In your case, for the squat and deadlift, you can probably get away with keeping the Prowler/sled work fairly constant through both phases. I would HIGHLY advise you to have several Prowler/sled options to avoid total boredom. So you could use your example above OR do:
6x40 @ 180
2x40 @ 90
4x40 @ 270
2x40 @ 270
2x20 @ HOLY SHIT, THIS WAS A HORRIBLE DECISION.