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Trying to recharge the house batteries while driving just does not work.
Why? Long wire runs from the front of your truck, the alternator, and to your 5Wh cuts volts down right there. Add all the wiring in the 5W too all adds up to dead batteries.
We do lots of boondocking, dead batteries was common.
There are a couple of fixes, one is to install at least a pair of 100 watt solar panels to recharge in conjunction with the truck, yes you can have multiple chargers running. You might have issues on a cloudy days.
We have 6 100 watt panels feeding a 200 amp 12 volt lithium battery, this runs everything but the A/C. I rarely use the house charger.
Also a DC to DC charger is another option. How those works is beyond the scope of this discussion. I think the solar is the cheaper easiest option. Since your rig is new, it may be prewired for panels.
I hear this complaint often. It is a misbelief that the house batteries can be recharged by driving.
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