Forget RV, think about truck
Your telling about the chassis battery and running gear
You should have separate engine and RV batteries
You should be able to use the RV side and not affect the engine side
How many batteries do you have ,?
Chevy 454 has a know problem with starter circuits and battery running down when sitting, so many people install a battery disconnect in the negative lead of start battery, to use when parked and save the start battery
House and engine,/ chassis should be on different batteries
If not, time to some how and fix that
Also install the disconnect on the engine battery
You went for days using the batteries,
Lights , water pump, phone charging? TV?
And you did not run the generator so the built in charge converter Could maintain the batteries ?
That's not a good idea
Run it everyday for a couple of hours and you might not ever get stuck again
All batteries have to be charged when you use them
These are not lithium cell phone batteries, they need to, Not be run dead, you can't use them until dead then recharge, like you phone
Just remember what happens to you car battery when you leave the lights on and run it dead a few times.. but bye battery, time to by new
I can explain it to you.
But I Can Not understand it for you !
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1997 F53 Bounder 36s