the rear Phoenix pair could be loaded on land-based aircraft for practice, training, show or actual usage
they could only be loaded on carrier based aircraft if it was actually doomsday, and the carrier needed to launch flights of six-packs to knock down hordes of Bears and Backfires, etc
the reason is that the rear end of the missile hit the carrier's deck on Launch,,,,,,creating the possibility of launching with six live, but, only being able to fire 4, 5 or 6,,,,,the risk was considered worth it, considering the dire threat if it was needed
so, trapping above the maximum gross weight (with 6) never came up, on the deck, just in discussions
it is a well photographed, legal load, though,,,,,,,,seen at a lot of shows and bases in the seventies