It would appear that the condensation that should run out across the roof from A/C operation is not going out the drain onto the roof and got deep enough to run inside the coach .
You'll have to get onto the roof and remove the covers , to get to the condenser drain pan , ( white tray under the condenser) and check the corner drains .
Phillips screwdriver, for top cover , 1/4 and 5/16 nut drivers, for the tin cover on the condenser , needle nose pliers, Q tips and rags.
A/C unit clean out should be done at least every second year , annually if used in dusty conditions.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.