Some years ago I parked in a campground (2014) with the aid of a tow truck Blown engine. took me 3 years or so before I towed it out and dropped..(well lifted) a new 8.1 into it (The old engine did not die it was murdered.. Long story insurance paid).
Across from me was another motor home. also an 8.1L Vortec that had been sitting there for years before I blew my ending. The owner was in hospice and not long for this world and his family finally authorized moving it to storage.. The batteries.. Toast.
The park owner got me a new engine battery and I put it in for him (He's not good at that kind of thing. I'm an old farm boy and you learn basics early on a farm) and with the help of his crew and shore power we got the slides pulled in (Two of us helped push) and jacks up (Had to assist one of 'em) and finally turned the key.. now this thing had very old gas. at least 5 years.. Fired up like it was brand new on the showroom floor.. Drove fine. I put it in the storage area and a few weeks later the family came and drove it away ha ha to wherever it went (i did not know)
I do believe this is not typical
I got enough generator time while there (In part thanks to a nearby himicane, er Hurricane Matthew) to keep my fuel fresh plus I SeaFoamed it.
Oh yes and then we had the Bang NO POWER night (The Bang was a car that went straight down the road... unfortunately the road did not go straight so it went THROUGH the power pole) (No serious injury save to some electroncs)
And a few other failures. Including two that took out half the park.. My half.. of course.
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times