Batteries question

Not sure what you mean by independent. If you are connecting all batteries together.. here are some other posts.

Add 12v to 2 6v
12 and 2 6v 2010

Sorry, I mean to not have the six volt batteries hooked to or connected to the trailer in anyway other than through the inverter and power cord

What you wish to do can be done. However, when drawing on the inverter, it would be better for it to draw on all possible batteries. Add a switch similar to this one from Napa

Thanks for the input, Don. Could you please elaborate re the inverter and switch ...

Joe,
I think you're mixing "inverter" with "converter". Your onboard converter uses shore power to charge batteries and provide 12 V power. An inverter takes 12 V power from batteries and provides 120 V AC.

There are no issues about leaving a 2 x 6 V battery set independent of the trailer's original 12 V battery. The question arises, why? If you wire the new 6 V's into the RV's charging circuit, when you're on shore power they get charged. Also, connecting the 6 V set into the existing 12 V power distribution, the whole battery bank nets you more power.

If you want to use the 6V's as an emergency backup, wire all the batteries together and use a main battery disconnects switch that has four positions: Battery 1, battery 2, Battery 1&2, off.

No issues. Go for it.

I guess I am looking at this this way. Using gen/solar, inverter and charge controller as a stand alone portable power station that would stay in the bed of my truck to be used only for boondocking and leaving it at home and using the factory set up for FHU's. Just toying with the idea so as not to be hauling all when not needed ....

Reading your original post it appears you want to install a 2nd or 3rd (motor home)12volt system independent of the existing system(s)

(On a motor home one system is the "Truck Parts" (Motor) and the 2nd (Which is common to trailers)is "Home".

So long as the system is independent...There can not POSSIBLY be a problem. (Assumes proper installation methods were used)

IF you want to parallel this new 12 volt system with the existing one... That too should work.

NOTE: you are not installing two Six volt batteries so much as a single BIG 12volt battery in 2 pieces....Think of the pair that way, As a single 12volt,Many questions go POOF if you do that.

DO pay attention to Polarity. AND use proper fuses

Some MHs tow a cargo trailer done up as a power station like that.

You can have the portable power station in the truck (but not so neat for going sight-seeing in the truck) and just plug the Rv shore power cord into the inverter in the truck.

You will need to "manage" the 120v stuff in the RV so it does not drain the batteries in the truck too much despite the solar helping in daytime.

12v in the RV can be from its own battery as usual or from its converter. In this case there is no "loop" to the batteries the inverter is on. But the converter can be a big draw on the inverter.

Needs some juggling and the Trimetric won't be showing the state of play for the batteries in the truck to help with the juggling act.

Could I just turn the converter off at the breaker ??