I have only looked at one RV manufaturer years ago when I was in the QA business. But also looked at many auto manufactures. RV they do, or did have a standard for the industry but it was pretty generic and losely followed. It was kind a like the ISO standards used in autos but they are not as detailed. Problem with these operations is they cannot be as automated like a high volume auto assembly line, and the workers try to do to many different tasks and even then they try to inspect it in at the end, just can't be done and it shows.