Page 32 of the RRG says (under Embark and Disembark)
When a unit disembarks, if the vehicle that is transporting
that unit has performed more than one standard move
during the current round, disembarking uses that unit’s
entire activation and it cannot perform additional actions or
any free actions
Page 42 of the RRG (under Movement) says:
The primary way that units move is by performing a move
action. When a unit performs a move action, it performs a
standard move, reverse, pivot, climb, or clamber.
So a reverse is not a standard move. Therefore, a GOCAT could deploy butt-towards-enemy, reverse twice (going the same speed it does going forward {page 52 under Reverse}), and then when the unit it is carrying activates they can disembark and then perform their standard action. Am I missing anything?