More reading up on the possible threat and it seems mostly for when they are in parallel but not being floated. time2roll has always said in that case the float voltage "floats all boats". The things that happen while being charged can matter, but from the incomplete info I have, are not damaging to the batts as such. Maybe more info on that will appear...
There will be longer times when the unit is parked and not plugged in with little or no solar, so I am just going to pull Stud 1, leave the 7-pin connected, and keep it that way. If the truck battery needs to be floated, I will do that with a separate maintenance charger I have.
That is easiest for my situation. If ever needing an emergency recharge for the House batt, I can put Stud 1 Pin 4 fuse back in or use the inverter method. Either way has the amps under the 25 amp charging limit for my particular House batt .
I don't know what Li guys do, but that's my plan. Ed-Gee's post is very interesting on his situation too.
