Depends on what kind of housekeeper they were, mainly. I have seen quality units in pristine condition, and if they were a fulltimer, probably most of the maintenance issues have been delt with and stuff works.
I am third owner of this rig, and the first two did not full time. First owner was competent, and the second did not have a mechanical cell in their body - BUT, they had it serviced every two months by professionals, so important stuff like lube, oil, filters, belts, hoses, etc were in good shape. Because they did not live in it full time, the batteries were flat, water pump full of junk, water faucets full of minerals, commode valve needed cleaning and lubing, little stuff like that that I could do.
I have been full timing a year, and when I get the rest of the interior wood oiled, it will be a unit anyone would want. Everything finally works. I love my coach.