If you are planning to add another 12v battery, be sure to hook them up in parallel. When charging them with the generator, you can hook it up directly to the batteries. You do not need to charge them separately - you can leave them hooked together. And you do not need to disconnect the battery leads to the trailer. Once you have the 2 12v batteries hooked up in parallel, take one lead (+) from the battery charger and hook it up to the (+) terminal of one of the batteries. Then take the (-) lead from the charger and hook it up to the (-) terminal of the same battery. You will have 2 charger leads coming off 1 battery.
Some people add, as you have mentioned, a separate 3 stage battery charger which is wired between the batteries and the generator. You have more control over the charging process this way and it is a better way to charge batteries. (IMHO).
If your batteries get run down from use during boon docking, I would not use the TT converter to bring the batteries up to charge. Instead, I would bypass it and use the generator to give them a boost. Not sure how many charging amps your generator puts out but I am guessing around 6 to 8.
Have you considered using 2 6v golf cart-type batteries instead of 2 12 volts? Personally, I think this is a better setup-especially if you are dry camping a lot.
These batteries are heavier and more costly but well worth the investment. To get roughly the equivalent amp hours, you would probably have to get Group27 12v batteries as opposed to Group24.
Hope this helps.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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