Gear down is your landing configuration, if you have a trickle undercarriage, the front leg may swing forward or back changing the C of G especially if using a heavy wheel (Intairco come to mind) some main legs also rake forward/backward on retracting and would also move the C of G when extended, best to check C of G with the gear extended and retracted, unless you are confident the C of G will not move or extended makes it nose heavy.
Mike