I would only add that you need to find ALL the leaks. I have been playing the old, "Aha! That was it!" game for weeks ~ fixing one leak that I thought was the only one, then having wet carpet again. Fixing another, more wet carpet.
You should really pull all that rear carpet and headliner out (be careful!! $$$) and let things dry really well. I would probably wash the carpet with something to kill the mold spores as best you can, or you can bet it will come back as soon as conditions are right again in the future.
With the carpet/headliner/trim panels out it will be very obvious where water is coming in and/or where it is pooling up. That was the only way to really see where all of my 9 (yes, nine: all slider window clips on DS, gas cap gasket, rear slider vent, rear quarter panel weld under hatch seal, side marker light, and rear window gasket) leaks were coming from. You really have to be sure you got it all, or the mold will come right back as soon as things get moist again.
If the rig is sitting for a few days, you might try some of that RV interior dessicant stuff. I don't think you want to drive around with it in there, as it will spill, but it will help absorb some of the hidden moisture. I also set my dual halogen shop lights in the back for a while to warm things up a bit. That seemed to help.
Good luck!
Steve