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I contacted battery tender, gave my tender model number and explained the application. They said the DC side has a reverse blocking diode so generators alternator voltage wont harm the tender. They also stated that if the generator also powers the tender, as long as AC power is not turned on...

I will check with the MFG on the charger. Hopefully I get a decent response and not the CYA response. I know the cell tower generator I once bought had the charger connected all the time but maybe the circuit powering the charger was not backed up (doubtful). Regarding inside or outside...

If the sensed voltage is over a set point the maintainer doesn’t turn on so I do not believe it would cause any harm to remain plugged in while the alternator outputs power

I believe the alternator puts out 4A and my maintainer puts out 2.5A. I am unsure of the generators DC amp draw while running but I would expect the 2.5A charger to keep it running for a long time if not indefinitely if the alternator fails.

So, if the alternator fails it will only run for about 10hrs until batteries drain? I should be able to extend that some since my maintainer is always plugged in to shore power.