Each unit has it's own AC breaker. By wire in series you mean to put them both on the same breaker?? Only reason to do that would to gain another breaker slot on the panel and if you did you would only be able to run one AC unit at a time.
The ceiling duct work is common to both AC units. Either or both discharge to all ceiling ducts.
You can turn the rear one on by itself to test and yes you need to test it. Both have a hi and low fan speed.
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Most RV batteries live a long and useful life, some are murdered.
2000 National Sea Breeze F53
1998 CRV Toad
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