Correct, everyone does things a little differently.
When I was running my MC7, one of the prime issues I kept up front was all systems were stand alone, such as Batteries for the engine, 24 V, 2, 8D, for the 12 kw Diesel Genset, a 12 Volt, 24 or 27, for house a single 24 or 27, as I always ran the genset non stop 24/7 when away from the garage. Each battery setup had a seperate charger, so could keep eye on all. More, the cooling system for each was a stand alone, same for fuel tank, genset had a 50 gal tank, the reason for all this was, if the MC7 died, I could maintain comfy from the genset, if the genset failed, I could run to motel, but one or the other was not a killer.
We are all nuts, ya know, just depends on who is judging who.