I had jumped my PXH to face a Timber Wolf, and skipped arm-mounted weapon attacks with the intent to grapple. The Timber Wolf had also jumped this turn. The PXH was pristine & undamaged.
When it came to the Physical Attack Phase, my PXH did not have the Grapple option available as I had expected.
(Yes, they were in adjacent hexes.) It was able to punch 2x.
What was preventing the Grapple from occurring?
Additionally, TW PG147 doesn't state that Push Attacks must be on an even level, though my units don't seem to be able to push a target that is higher or lower; I have not tried pushing a vehicle on a L1 terrain from a L0-terrain BattleMech - Not sure if it would have any effect, but if it would be useful if it could force it out of the hex.