100 series wagon rear tailgate leaking

hello, just wondering if anybody has any ideas on fixing a leak in the rear tailgate doors of a 100 series cruiser, they are the non barn door type , there appears to be a little bit of movement in the doors and I would like to know if there is any way of adjusting latches to make them close a bot tighter, trying to avoid new rubbers as they appear to be in good condition
ghecko1100