I find the online interactive parts drawings are a place I can do some "looking through walls" at the things that we can't see well, normally.
https://catalog3d.winnebagoind.com/menu/Parts.htm
It takes a bit to get used to "driving" it but once you get the idea, you can really look at lots of small points to avoid some of the design errors that can give us fits. Plumbing is one where I tend to shy away from the type where the handle on the drain valve goes in and the cable has to bend back 90 degrees to pull the valve. They tend to show here on the forum as the cable gets loose. think of the cable like on lawnmowers for throttle, etc. ?
In a quick look at plumbing? I see none of that problem and the drain seems short and simple at that point.
However one point might be something to take a firm look at, depending on health and condition of users? There are two different builds, early and later in the year, so one point might be to check the serial number (not VIN!) for the 7th digit of 1 for early or 2 for later build. That can lead to some changes which are often made due to what they may find as better designs?
Label on left of driver will give that info!
Sometimes cheaper to build but others due to finding the first try is a problem to maintain!
https://catalog3d.winnebagoind.com/menu/Parts.htm
The parts drawings also let you locate anything like converter, inverters, etc. that you might wonder about? Like how big is the holding tank? Where is it?
the small point I might want to look at is how high the shower step might be as it looks from here like it is higher than some? That may be a "fake" problem due to drawings not telling a true story!
I see no big problems but I like to look for those small points that may bug me!
Happy shopping!