Install 3rd A/C

I would opt to replace one of the current ac's with a bigger unit if possible , the one closest to the rear bedroom. the hole is already there along with the support and wiring , others have said you would need for 3rd ac.

8500W is 70A which will run 3 ACs. Assuming you have 2 35A circuits you need to look at how to balance all of the loads as you'll now have 2 ACs on one circuit. Do you have room for another CB? A new CB won't be part of any EMS unless you change it also. Ceiling and wall wiring for another AC might be a challenge depending upon your rig.

Only you can decide on the "hassle" factor.

Have you looked into the RV portable air conditioner units. These have come a long way and apparently do nice job. I don't know anything about these portable air conditioners. I notice they have one with one port and another style with two ports???





Just something else to ponder on maybe...
Roy Ken

Anything can be done if you throw enough money at it. It is a matter of cutting in another roof opening (fairly simple). However, there needs to be structural support for the AC unit (difficult). Also, you need to run power to the unit (difficult).

Have you checked if the existing AC units are working properly? Are they charged correctly (overcharged is as bad as undercharged)? Get it checked by a good HVAC tech, not an RV dealer unless they are someone you trust to do good work. I have seen many AC systems checked by an RV tech and they just charged with refrigerant rather then looking for the true cause of the loss of refrigerant.

If the units check out properly, then you may want to look into going to higher capacity units to replace your existing units.

Have you tried pushing the front cool air to the rear with a floor fan? It works great for me but I don't have a black rig either. As spiffy as it looks, they sure don't cool well.