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Welcome to the Forum. It's not a dumb question at all. If it were, we'd all be dumb because this is a place to ask questions.
Do you have a battery tester? If the trailer has been sitting on a dealer lot for a year, the batteries could have been run down many times and recharged sporadically. It wouldn't be the first time a new trailer came from a dealer with bad batteries. If you can show they didn't last very long, make a warranty claim. Letting them go dead a lot of times can shorten battery life.
Check the water in the batteries too. That could be too low—it should cover the plates.
Gene
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