The following is only for occasional overnight use.
We still have the original dealer provided marine style deep cycle battery and a residential fridge. We only "boonedock" when needed and that means late arrival and early departure at Wally's or Crackerbarrel. We don't use the TV as we don't extend the slides. At warm or moderate tamps we make it overnight without issues. The truck will recharge the battery the next day. If the furnace is needed I do have a generator I can run as the battery won't do it.
Again the key phrase is "occasional overnight"
ps. the dealer has said it probably should have had two batteries.
2017 Lariat F-350 FX4, CC, SB, 6.7 PSD 4WD
2018 MONTY 3731FL, at our private winter site in GA