Mine has a parasitic ghost drain, leave it for 5 days on its own the the batteries are dead, even if the battery cutoff switch flipped.
My RV Repair, the owner is a worker to. He says he has yet to see a RV of any brand last very long without power. Ghost drains are the norm, not the exception.
I have 2 Odyssey Extreme grp 34 batteries in mine and this is a good a battery as money will buy until you get into the nosebleed stuff they use in extreme extreme use like NASA. I have one I bought almost 15 years ago and its still cooking.
US Army Infantry Retired
Texas Hill Country
Cedar Creek Silverback 29RE
'19 F 350 CC, LB King Ranch Ultimate