Dripping LR AC

You should not turn those bolts more than 1-1/2 turn.

If not frozen fins, your A/C is leaking around the compression gasket. There is a square foam gasket that is placed between the roof A/C and the roof. It seals the unit to the roof. Over time, they compress and will allow water in, both rain and A/C run off. If you remove the inside cover, you'll see four 7/16" bolts, one in each corner. You need to SNUG these down. This should be done every year or two. I like to use a 1/4" drive socket set so that I don't use too much pressure. Again, snug, not tight.

First thing to check if your A/C is leaking inside the coach is your inside filters. If they are clogged, your fins will ice up and water will leak inside. Remove the filters and clean/replace them. Run your A/C on FAN ONLY for about 15-20 minutes and your issue will go away...Dennis

Did you try tightening down the 4 screws and compressing the gasket a little. Is it coming from outside or the ducts.

If you have ducted AC is there any chance that you have a roof leak that is getting in to the duct work?
With the rear AC blowing it is possible that the air flow is blowing water towards the LR AC unit.
Besides a roof leak, I would check the BR AC unit to make sure that it is draining properly and not allowing water to get in to the duct.