Nearest RV store will have a battery isolation relay. It looks like a starter relay, but is designed for continuous operation rather than for short bursts like a starter.
It should come with a wiring diagram. If it doesn't, the small terminal goes to a source of 12 volt power that's only hot when the engine is running (or the key is on, if you can't find a source that operates from the engine itself). This ensures that the relay will disconnect the trailer battery from the tow vehicle battery when you shut the tow vehicle off.
There will be two larger terminals. One of these (either one on the units I've seen) goes to the hot side of the battery through a fuse or circuit breaker sized for the size of wire you're using. The other large terminal goes to the AUX connection on the trailer connector. # 10 or 12 wire with a 30 amp fuse/breaker is probably a good size for the interconnect wiring, as it will somewhat limit the maximum amount of current a dead trailer battery can draw.
What kind of a tow vehicle are you using? If you have a factory tow package, I would expect most newer vehicles to have a trailer battery charge circuit already in place. My '99 Ford does.
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