If the battery is 1) hot, and 2) smoking, something is causing that. Something is wrong with the battery, or it's connected to something that is shorted and not on a fuse, or there's something wrong with the Power Converter that charges the battery.
If you turn off the circuit breaker for the Power Converter, that should eliminate the possibility that the problem is originating there.
If it doesn't cool down, you'll need to disconnect the battery. At that point you would turn the circuit breaker back on for the Power Converter so that the 12V devices inside the RV have power.
A hot, smoking battery is dangerous.
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I would also suggest you get your wife and kids out of the trailer until you resolve the problem.